Please help if you can, this is due in two days.

Please Help If You Can, This Is Due In Two Days.

Answers

Answer 1

The length of side PT by using the ratio of similar triangles is 49/3 or 16 1/3. Option A is correct.

Calculating the sides of similar triangles.

Triangles that are similar to one another in terms of shape but not necessarily size are called similar triangles. In simple words, if two triangles are similar, their corresponding sides are proportionately equal and their corresponding angles are also equivalent.

In the event that two triangles are similar with sides P, Q, R and p, q, r, then the pair of their matching sides is also proportional.

From the given figure, using the ratios of similar triangles;

QP/QS = RP/RT

(12+28)/12 = (7 + x)/7

40/12 = (7 +x)/ 7

7(40/12) = 7 + x

70/3 = 7 + x

x = 49/3 o 16 1/3

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Related Questions

In Exercises 69 and 70, match each equation with its graph. Do not use a graphing device, and give reasons for your answer: 69. y = x b. y =X J =r0'

Answers

In the given plot, the graph of y=x⁴ is  g, the graph of y = x⁷ is  f and the graph of y=x¹⁰ is the h.

While plotting graphs with power to x values, it usually depends on two things. For example, lets take an equation, y = kxⁿ

As the value of coefficient of x, that is k increases the graph becomes narrower and as the value of k decreases the graph becomes wider. Here in the questions given all have the same coefficients for x, k=1.

So here the graph only depend on the power of x.

As the power increases the graph gets gets narrower. So the graph of x¹⁰ will be narrower than x⁴. As both 10 and 4 are even numbers, for all values of x, y will be positive and parabolas are formed.

In the case of x⁷,  as 7 is odd the value of y can be both positive and negative.

If x=1, y=1⁷ = 1

  x= -1, y = (-1)⁷ = -1

So the graph will be like f as shown in the figure.

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The complete question is included in the image.

Find the slope of the line described in the table.

m = 0

m = 1

m = 2

m = 3

m = 4

Answers

The slope of the line described in the table is m=3.

What is Slope of Line?

The slope of the line is the ratio of the rise to the run, or rise divided by the run. It describes the steepness of line in the coordinate plane.

The slope intercept form of a line is y=mx+b, where m is slope and b is the y intercept.

The slope of line passing through two points (x₁, y₁) and (x₂, y₂) is

m=y₂-y₁/x₂-x₁

The points from the table are (2, 6) and (3, 9)

Slope=9-6/3-2

=3/1

=3

Hence,  the slope of the line described in the table is m=3.

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help will mark brainlist

Answers

Step-by-step explanation:

the area of a triangle is

baseline × height / 2

we have here 3 triangle sides.

the painter can only paint the sides, not the base area.

the painting area is therefore the sum of the 3 sides :

3× 50×40/2 = 3× 50×20 = 3000 ft²

75% of the area = 3000 × 0.75 = 2250 ft²

100 ft² in 18 minutes

it takes

2250/100

times of the time it takes to paint 100 ft² (18 minutes).

so,

18 × 2250/100 = 405 minutes

it takes the painter 405 minutes to paint 75% of the pyramid.

4. Johnny has an old horse trough which he uses
to plant flowers. His planter is shaped like a
triangular prism. The planter is eight feet in
length and has a base of four square feet. He will
be filling the planter with potting soil. Each bag
has 1.5 cubic feet of potting soil. How many bags
of soil will Johnny need to purchase?

Answers

We learn from the question that Johnny will need to buy 11 bags.

What is Applications for planters ?

When you don't have much room, planters are a terrific choice since they let you showcase little trees and plants everywhere there is some sunshine. And you can still accept gardening and enjoy the benefits of raising your own food even if you just have a small patio, driveway, or balcony.

We'll start by determining the planter's volume. To achieve this, we'll calculate a triangular pyramid's volume:

Volume = (Ground Area x Altitude) / 3.

The planters measures 4 square feet in base area and 8 feet in height, so:

Volume = (4 x 8) / 3

Volume = 16 cubic feet

Now we know that Johnny needs 16 cubic feet of potting soil, and each bag of soil has 1.5 cubic feet, so:

Number of Bags = Volume / Volume per Bag

Number of Bags = 16 / 1.5

Number of Bags = 10.67

Since Johnny can't buy fractional bags of soil, he'll need to purchase 11 bags.

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which of the following point ranges includes the median reading test score for ninth grade students in school district x for 1993 ?

Answers

The point ranges 65-69, includes the median reading test score for ninth grade students in school district x for 1993. So, the correct choice is option (b).

The median class is defined as the class interval whose cumulative frequency is greater than (and nearest to) n/2. We have a pair chart of reading test score for ninth grade students in school district x for 1993. Total number of students in ninth grade in school district x for 1993

= 1200. We have determine the point ranges includes the median reading test for ninth grade. Now, see the pie- chart carefully.

16% points below 65 37% points in range 65-6925% points in range 70-7914% points in range 80-898% points in range 90-100

The above figure contains a cumulative frequency table of students points.

Also, n/2 = 1200/ 2 = 600 and we see the class 65-69, consists cumulative frequency value, 636 > 600. So, it is the median class. Hence, the required point ranges is 65-69.

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Complete question:

Which of the following point ranges includes the median reading test score for ninth grade students in school district x for 1993 ?

a) Below 65 points

b) 65 - 69 points

c) 70- 79 points

d) 80 - 90 points

e) 90- 100 points

What are the intercepts and asymptotes of h(x)? Explain how to find these using the graph.

Answers

Looking at the asymptotes  graph, it crosses the y-axis at y = h(x) = -1

Thus, the y-intercept is -1. The graph also crossed x-axis at..

How do you find the asymptotes on a graph?

Set the denominator to 0 and solve for x to discover the vertical asymptotes. Given that this has already been factored, solve by setting each component to zero. They are expressed as equations of lines because the asymptotes are lines.

Consequently, -1 is the y-intercept. The graph also veers off the x-axis here.

Consequently, -1 is the y-intercept. The graph also veers off the x-axis here.

As soon as the denominator equals 0, the vertical asymptotes appear. Accordingly, (2x)(x-4)=0. Vertical asymptotes are thus defined as x=0 and x=4.

Given that the degrees are identical, the horizontal asymptote in this situation corresponds to the ratio of a leading coefficients. y = [(1)(1)/(2)(1)] = 1/2.

Simply changing x = 0 makes finding the y-intercept simpler. On the other hand, because x = 0 is indeed a vertical asymptote,

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Every body loves aster. the quantifier of this sentence​

Answers

everyboby

Step-by-step explanation:

because it is talking about how much people love her

Please help me with this question.

Answers

The differentiation of the given function is [tex]\frac{d}{dx}\left(\frac{e^{4x}}{x^7}\right)=\frac{e^{4x}\left(4x-7\right)}{x^8}[/tex]

What is differentiation?

The derivative of a function of a real variable measures the sensitivity to change of the function value with respect to a change in its argument. Derivatives are a fundamental tool of calculus.

Given is function, [tex]y = \left(\frac{e^{4x}}{x^7}\right)[/tex], we need to differentiate the given function,

[tex]\frac{d}{dx}\left(\frac{e^{4x}}{x^7}\right)[/tex]

Applying quotient rule,

[tex]\quad \left(\frac{f}{g}\right)^'=\frac{f\:'\cdot g-g'\cdot f}{g^2}[/tex]

[tex]=\frac{\frac{d}{dx}\left(e^{4x}\right)x^7-\frac{d}{dx}\left(x^7\right)e^{4x}}{\left(x^7\right)^2}[/tex]

[tex]=\frac{e^{4x}\cdot \:4x^7-7x^6e^{4x}}{\left(x^7\right)^2}[/tex]

[tex]=\frac{e^{4x}\left(4x-7\right)}{x^8}[/tex]

Hence, the differentiation of the given function is [tex]\frac{d}{dx}\left(\frac{e^{4x}}{x^7}\right)=\frac{e^{4x}\left(4x-7\right)}{x^8}[/tex]

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The usher at a wedding asked each of the 80 guests whether they werea friend of the bride or of the groom. The results are: 59 for Bride, 50 for Groom, 30 for both. Given that the randomly chosen guest is the friend of groom, what is the probability that the guest is the friend of bride, P (bride | groom)

Answers

The probability that can be determined by the randomly selected person from this sample was a friend of the bride OR of the groom is 0.9875.

Given information is that, at a wedding, each guest asked the 80 guests if they were a friend of the bride or of the groom.

Probability is measured by the ratio of the number of favorable outcomes to the total number of outcomes of an event.

The total Number of Guests which forms the Sample Space, n(S)=80

Let the event for a friend of the bride=A

Let the event be for a friend of the groom=B

n(A) =59

n(B)=50

Friends of both bride and groom,

So,

n(A∪B)=n(A)+n(B)-n(A∩B)

n(A∪B)=59+50-30

n(A∪B)=79

The number of people or Guests who are the friends of the bride OR of the groom = 79

Thus,

P(A∪B)=n(A∩B)/n(S)

= 79/80

P(A∪B)= 0.9875

Therefore, the probability that a randomly selected person from this sample was a friend of the bride OR of the groom is 0.9875.

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Krutika was thinking of a number. Krutika subtracts 9.9 from the number and gets an answer of 31.6. Form an equation with x from the information.

Answers

Answer:

x - 9.9 = 31.6

Read the problem. 24 of the students in Mr. Griffin's class like to play sports. That is 80% of the students in the class. Shade the grid to show the percent of students who like to play sports. How many total students are in Mr. Griffin's class? You can use your model to help. Submit students​

Answers

20 number of students are interested in sports in the class.

How can I find the percentage of a number?

A percentage is a figure or ratio that may be stated as a fraction of 100 in mathematics. If we need to compute the percentage of a number, divide it by the entire and multiply by 100. The number is multiplied by 80 and then divided by 100. To demonstrate, consider the following formula:

(Number 80) 100 = Solution

Method No. 2

You shift the decimal point in 80.00 two places to the left, then multiply by your number. As a result, the formula is:

Number 0.8 = Solution

25×0.8= 20

The first approach is useful for learning how to get 80% of a number. When you understand how, the second technique is faster to implement.

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g(x)=(x+1)^3(x+3)(x-2) Every function has the zeroes x=-1,x=-3, and x=2.

Answers

It is true that the polynomial function g(x) has the zeros x = -2, x = -3 and x = 2

How to determine the true statement

From the question, we have the following parameters that can be used in our computation:

g(x)=(x+1)^3(x+3)(x-2)

Set the function to 0 to determine the zeros

So, we have the following representation

(x+1)^3(x+3)(x-2) = 0

Remove the exponents

(x + 1)(x + 3)(x - 2) = 0

Split

x + 1 = 0, x + 3 = 0 and x - 2 = 0

Solve for x

x = -2, x = -3 and x = 2

This is the same as the set of zeros given in the question

Hence, the given zeros are true

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Could someone please help me?

Answers

Answer:

B

Step-by-step explanation:

[tex](x-1)(x+1) = x^2 -1\\(x+5)(x-5) = x^2 -25[/tex]

The problem: Two parabolas have the same x-intercepts (one positive
x-intercept, and one negative x-intercept. The maximum or minimum value of
the first is 2 times the maximum or minimum value of the other. Sketch these
parabolas on the same coordinate grid (with at least 3 points)
-15
-10
-10
-15
10

Answers

A parabola can have 2 x-intercepts, 1 x-intercept or zero real x intercepts.

Is it possible for a parabola to have more than one x-intercept?

Image search results for The x-intercepts of two parabolas are the same (one positive and one negative). The maximum or minimum of the first is twice the maximum or minimum of the other. Draw these parabolas using the same coordinate grid (with at least 3 points) “-15” “-10” “-10” “-15” 10

The x-intercepts are the spots where the parabola contacts the x-axis. A parabola can have two, one, or no real x intercepts. A parabola might have two x-intercepts, one x-intercept, or none at all.

X-intercepts, or zeros, are the places where a parabola (or any curve) crosses/touches the x-axis. As we’ll see later, the amount that determined

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Q1a) Find dy/dx and d2y/dx2. x=t2+3, y=t2+5t Q1b) For which values of t is the curve concave upward? (Enter your answer using interval notation.) I was able to find dy/dx and d2y/dx2 However for Q1b) I am unsure what is the value of t is when the curve concave upward dy/dx= 2t+5/2t d2y/dx2= -5/4t3

Answers

The first derivative of y with respect to x is d(y)/dx = 4t² + 10t, and the second derivative of y with respect to x is d(2y)/dx² = 8t + 10.

Differential equations are mathematical equations that describe how a function changes over time or with respect to its inputs.

Let x = t² + 3 and y = t² + 5t. We want to find the derivatives of y with respect to x, which means we need to use the chain rule.

The chain rule states that if y = f(u) and u = g(x), then the derivative of y with respect to x is given by

=> d(y)/dx = d(y)/du * du/dx.

First, we will find the derivative of y with respect to t, which is given by

=> d(y)/dt = 2t + 5.

Next, we will find the derivative of x with respect to t, which is given by

=> d(x)/dt = 2t.

Finally, we will multiply these two derivatives to find the derivative of y with respect to x, which is given by

=> d(y)/dx = (2t + 5)(2t) = 4t² + 10t.

Next, we will find the second derivative of y with respect to x, which is given by

=> d(2y)/dx² = d((4t² + 10t))/dt = 8t + 10.

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Assuming large between subject variability, which of the following tests is usually the most sensitive (N held constant)? 1. they are all equal in sensitivity 2. t test for independent groups 3. t test for correlated groups 4. sign test

Answers

The t-test for independent groups is usually the most sensitive test when there is large between-subject variability and the sample size (N) is held constant.

The t-test for independent groups allows for the comparison of two independent groups, and can detect differences in the means between the two groups that may not be detected by other tests. The t-test for correlated groups is less sensitive than the t-test for independent groups, as it assumes that the two groups are related or correlated. The sign test is a non-parametric test and is less sensitive than the t-test for independent groups as it does not take into account the variability between the two groups.

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abcd is a parallelogram with sides ad=6 cm and ab=12 cm. point e dc and the extensions of be and ad intersect at point f. if the mid segment of the trapezoid abed is 10 cm long, find df and the ratio between the areas of def and abf

Answers

E and F are the midpoints of AB and CD, respectively, making ABCD a parallelogram. Any line that crosses AD, EF, and BC at G, P, and H is designated as GH. So, GP = PH.

What is meant by parallelogram?A quadrilateral with opposite sides that are parallel and equal is known as a parallelogram. The interior opposite angles of it are equal. Additionally, the angles on the same side of the transversal are complementary to one another or add up to 180 degrees. A quadrilateral is referred to as a parallelogram in geometry. The opposite sides of a parallelogram are parallel and of equal length. Rhombus, rectangle, and square are a few instances of parallelograms.Parallelograms come in 4 different varieties, including 3 unique varieties. The four varieties are rhombuses, parallelograms, squares, and rectangles.

E and F are midpoints, resulting in AB and CD, respectively.

[tex]$\therefore \mathrm{AE}=\mathrm{BE}=\frac{1}{2} \mathrm{AB} \text { and } \mathrm{CF}=\mathrm{DF}=\frac{1}{2} \mathrm{CD}[/tex]

But, [tex]$\mathrm{AB}=\mathrm{CD}$[/tex]

[tex]$\therefore \frac{1}{2} \mathrm{AB}=\frac{1}{2} \mathrm{CD} \Rightarrow \mathrm{BE}=\mathrm{CF}[/tex]

Also, [tex]BE \| CF $\quad[\because \mathrm{AB} \| \mathrm{CD}]$[/tex]

therefore BEFC is a parallelogram.

[tex]$\Rightarrow \mathrm{BC} \| \mathrm{EF}$[/tex] and [tex]$\mathrm{BE}=\mathrm{PH}$[/tex]

Now, BC \| EF

[tex]$\Rightarrow \mathrm{AD} \| \mathrm{EF} \quad\left[\because \mathrm{BC} \| \mathrm{AD}\right.$[/tex] as ABCD is a [tex]$\left.\|^{\mathrm{gm}}\right]$[/tex]

[tex]$\Rightarrow \mathrm{AEF} \mathrm{D}$[/tex]is a parallelogram

[tex]$$\Rightarrow \mathrm{AE}=\mathrm{GP}$$[/tex]

But, [tex]\mathrm{E}$ is the mid-point of $\mathrm{AB}$[/tex]

[tex]\therefore \mathrm{AE}=\mathrm{BE}[/tex]

[tex]\Rightarrow \mathrm{GP}=\mathrm{PH} \quad$ [Using (i) and (ii)[/tex]

The complete question is:

ABCD is a parallelogram, E and F are the mid-points of AB and CD respectively. GH is any line intersecting AD, EF and BC at G,P and H respectively. Prove that GP = PH.

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Find f of 8 for the following equation

Answers

The d f of 8 for the following equation  is-   7698

f₍ₓ₎ = ᵃˣ²+ᵇˣ²+c

f₍₀₎ = a*0²+b*0+c = 2

   = 0+0+c=2

  c=2

f₍₃₎ = a(3)²+b*3+c = 128

    = 9a + 3b +2 = 128

   = 9a+3b = 128-2

    9a+3b = 126    equation  (i)

f₍₅₎ = a (5)² + b*5 + c = 2048    = 25a + 5b + 2 = 2048

     25a+ 5b = 2046    equation ( ii)

equation (ii) is multiplied by 3 and equation (i) multiplied by 5  we get,

       25a+ 5b = 2046

           9a+3b = 126  

Subtracting equation (ii) from equation (i)

          75a + 15b  = 6138

          45a + 15b = 630

          30a        = 5508

       a = 5508/30

         a  = 184

 now , putting the value of a in equation (i)

     9*184+3b+2  = 128

      1656+3b +2 = 128

   3b = 128-1658

    b = -510

f₍ₓ₎ = 184 x² - 510x + 2

  = 184*64 - 510*8 +2

  = 11776 - 4080+2

  = 7698 ans.

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What is the decimal equivalent of 714.45/9 ?

Answers

Answer:

Step-by-step explanation:

decimal equivalent of 714.45/9

divide it by 9 taking to 79.383333

Month J F M A M J J A S O N D
Sales 1520 1680 2050 1950 1520 1350 1250 1150 1610 1715 1825 2150
α=0.1
α=0.3
α=0.5

Answers

The second one is correct

Point L L is located at ( − 5 , − 2 ) (−5,−2) on the coordinate plane. Point L L is reflected over the y y-axis to create point L ′ L ′ . What ordered pair describes the location of L ′ ? L ′ ?

Answers

Answer:

(5, -2).

Step-by-step explanation:

The point L' will have the same y-coordinate as L, but the x-coordinate will be opposite in sign. Since L is located at (-5,-2), L' will be located at (5,-2). So the ordered pair that describes the location of L' is (5, -2).

3x + 4y =26
2x + 4 = 28

Answers

Answer:

x = 12

y = -2.5

Step-by-step explanation:

2x + 4 = 28

2x = 24

x = 12

So, we know x = 12; now we put 12 back in for x and solve for y

3(12) + 4y = 26

36 + 4y = 26

4y = -10

y = -2.5

Let's check

3(12) + 4(-2.5) = 26

36 - 10 = 26

26 = 26

So, x = 12 and y = -2.5 is the correct answer.

Please help me with this question.

Answers

The equation of the parabola with given vertex and focus is (y-11)² = 36(x-7).

What is an equation of a parabola?

A parabola refers to an equation of a curve, such that a point on the curve is equidistant from a fixed point, and a fixed line.

The general equation of a parabola is: y = a(x-h)² + k or x = a(y-k)² +h, where (h, k) denotes the vertex. The standard equation of a regular parabola is y² = 4ax.

Given that, Vertex (7, 11), focus (16, 11).

Let us find an equation of the parabola for vertex (h, k)=(7, 11) and focus (16, 11).

It can be observed that both focus and vertex lie on y = 11, thus the axis of symmetry is a horizontal line.

a = 16-7 = 9 as y coordinates are the same.

Since the focus lies to the left of vertex, a = 9

Use the equation (y-11)² = 4×9(x-7)

(y-11)² = 36(x-7)

Therefore, the equation of the parabola with given vertex and focus is (y-11)² = 36(x-7).

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The standard equation of the parabolas with vertex (7, 11) and focus (16, 11) are:

(y - 11)² = 36(x - 7)

What is a parabola?

A parabola is an equation of a curve, such that any point on the curve is equidistant from a fixed point called the focus and a fixed line called the directrix of the parabola.

We have,

(y - k)² = 4p (x - h) open right

(y - k)² = -4p (x - h) open left

Where focus = (h - p, k)  or (h + p, k) and vertex = (h, k)

Now,

Equation of parabola (y - k)² = -4p (x - h) that open left.

(h, k) = (7, 11)

h = 7 and k = 11

(h - p, k) = ( 16, 11)

h - p = 16

7 - p = 16

7 - 16 = p

p = -9

So,

(y - 11)² = 36(x - 7)

Equation of parabola (y - k)² = 4p (x - h) that open right.

(h, k) = (7, 11)

h = 7 and k = 11

(h + p, k) = (16, 11)

h + p = 16

7 + p = 16

p = 16 - 7

p = 9

So,

(y - 11)² = 36 (x - 7)

Thus,

The standard equation of the parabolas is:

(y - 11)² = 36(x - 7)

(y - 11)² = 36 (x - 7)

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You put $500 in an account. The
account earns $55 simple interest in 5
years. What is the balance of the account?
HURRY HELP

Answers

The total amount present in the account is  $555 in 5 years with a rate of 2.2%.

What is Simple Interest ?

Simple interest is a way to figure out how much interest will be paid on a sum of money at a specific rate and for a specific duration of time. Contrary to compound interest, where we add the interest of one year's principal to the following year's principal to compute interest, the principal amount under simple interest remains constant.

Simple interest is a quick and simple approach to figure out how much money has accrued interest. Interest is always applied to the initial principle amount and is calculated at the same rate for each period of time. Any bank where we deposit money will pay us interest on that amount. Simple interest is one of several forms of interest that banks charge.

It is given The initial Principal is $500

The interest earned is $55

The total amount present in the account is $(500 + 55) = $555 in 5 years

The rate of interest is r(say)

principal * rate * time = interest

⇒500* r * 5 = 55

⇒ r = 0.022 = 2.2 %

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A box has length 5 feet, width 8 feet and height 3 inches. Find volume in cubic feet and in cubic inches

Answers

Answer:

120 inches

Step-by-step explanation:

5 x 8 x 3 = 120

what fraction of clockwise revolution does the hour hand of clock turn through when it goes from

Answers

Answer:

On the clock from 3 to 9, the hour hand turns clockwise 1/2 of the revolution. On the clock from 4 to 7, the hour hand turns clockwise 1/4 of the revolution. On the clock from 7 to 10, the hour hand turns 1/4 of the revolution clockwise. On the clock from 12 to 9, the hour hand turns clockwise for 3/4 of the revolution

Step-by-step explanation:

Which of the following conversion factors would be best used to convert 20 kilometers (km) to miles (mi)?

100cm /1m
0.62mi / 1km
1km / 0.62mi
5280 ft / 1mi

Convert 20 kilometers to miles. Round to the nearest tenth. (If necessary, round to two decimal places.)​

Answers

Answer:

12.4 miles

Step-by-step explanation:

It would be 1km / 0.62mi as this gives us a direct relationship between kilometers and miles. It's essentially telling us each kilometer is equal to 0.62 miles. Since we have 20 kilometers and we want to convert this to miles, we just multiply by 20 by 0.62 miles which gives us 12.4 miles

its for a grade i need 3 questions done

Answers

A table of equivalent ratios for the number of toss and amount of dollars is as follows:

Toss             Dollars

25                    4

50                    8

75                    12

What is a proportional relationship?

In order to have a proportional relationship and equivalent ratios, the variables x for toss and y for dollars must have the same constant of proportionality.

Next, we would determine the constant of proportionality (k) as follows:

Constant of proportionality (k) = y/x

Constant of proportionality (k) = 12/75

Constant of proportionality (k) = 0.16.

When hours y = 8, the amount of dollars x is given by:

x = y/k

x = 8/0.16

x = 50.

When the amount of dollars x = 25, the number of toss y is given by:

y = kx

y = 0.16(25)

y = 4.

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Show me you work!
Subtract: 2 1/4 - 1 2/3 =

A) 1 7/12
B) 1/3
C) 5/12
D) 7/12

Answers

7/12 is the value of fraction .  

In math, what is a fraction?

A fraction is a piece of the entire. The quantity is written as a quotient in mathematics, where the numerator and denominator are divided. Both are integers in a simple fraction.

                    Whether it is in the numerator or denominator, a complex fraction contains a fraction. The numerator and denominator of a correct fraction are opposite each other.

= 2 1/4 - 1 2/3

= 9/4 -  5/3

 =   27 - 20 /12

 = 7/12

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Which equation could generate the curve in the graph below?

Answers

Answer:

below

Step-by-step explanation:

When y = 0    the negative x value of the vertex needs to be a negative number ....the second equation will do this...the first will not

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