A red die is tossed and then a green dieis tossed. What is the probability thatthe red die shows an even number orthe green die shows an even number?Make sure your answer is reduced.3[?]Hint: The two events are not mutually exclusive. Soto the find the probability of the union, use:P(A or B) = P(A) + P(B) - P(A and B)L
Answers
Given:
A red die is tossed and then a green die is tossed.
Required:
We have to find the probability that the red die shows an even number or the green die shows an even number.
Explanation:
Let A denotes the event that the red die shows an even number and B denote the event that the green die shows an even number.
Here the total number of outcomes is 6(1-6) and the number of favorable outcomes are 3(2, 4, 6).
Then we have
[tex]\begin{gathered} P(A)=\frac{3}{6}=\frac{1}{2} \\ \\ P(B)=\frac{3}{6}=\frac{1}{2} \end{gathered}[/tex]Therefore,
[tex]P(A\text{ and }B)=\frac{1}{2}\times\frac{1}{2}=\frac{1}{4}[/tex]Hence the probability that the red die shows an even number or the green die shows an even number is
[tex]\begin{gathered} P(A\text{ or }B)=P(A)+P(B)+PA(A\text{ and }B) \\ \\ =\frac{1}{2}+\frac{1}{2}-\frac{1}{4} \end{gathered}[/tex][tex]\begin{gathered} =1-\frac{1}{4} \\ =\frac{3}{4} \end{gathered}[/tex]Final answer:
Related Questions
A rectangular carport has area 150 square feet. The height of the carport is five feet less than twice its length. Find the height and the length of the carport.
Answers
We are given that the area of a rectangle is 150 square feet. If "h" is the height and "l" is the length then the area is given by:
[tex]hl=150[/tex]We are also given that the height is 5 feet less than twice its length, this can be written mathematically as:
[tex]h=2l-5[/tex]Now we can replace the value of "h" in the equation for the area:
[tex](2l-5)l=150[/tex]Now we use the distributive property:
[tex]2l^2-5l=150[/tex]Now we have a quadratic equation that can be written as:
[tex]2l^2-5l-150=0[/tex]We can factor this equation to determine the values of "l". We multiply and divide by 2:
[tex]\frac{4l^2-5(2l)-300}{2}=0[/tex]Factoring in the numerator:
[tex]\frac{(2l-20)(2l+15)}{2}=0[/tex]Now we take common factor in the first parenthesis in the numerator:
[tex]\frac{2(l-10)(2l+15)}{2}=0[/tex]Simplifying:
[tex](l-10)(2l+15)=0[/tex]Now we set each factor to zero:
[tex]\begin{gathered} l_1-10=0 \\ l_1=10 \\ 2l_2+15=0 \\ l_2=-\frac{15}{2} \end{gathered}[/tex]We take the positive value, therefore, the length of the rectangle is 10 feet. Now we replace this value in the equation for the height.
[tex]h=2(10)-5[/tex]Solving we get:
[tex]\begin{gathered} h=20-5 \\ h=15 \end{gathered}[/tex]Therefore, the height of the rectangle is 15 feet.
A cellphone company offers two talk and text plans. The company charges a monthly service fee of $20 for either plan the customer chooses: Customers that choose Talk and Text Plan A are charged five cents a minute and twenty dollars for 250 texts. Customers that choose Talk and Text Plan B are charged ten cents a minute (first 100 minutes free) and fifteen dollars for 200 texts. The equation c = .10(m – 100) + 15 + 20 can be used to represent how much a customer would spend monthly for the minutes used. ** Express Plan A as an equation where c equals the cost and m equals the minutes used. a. Graph each Talk and Text plan to determine when both plans cost the same.
Answers
For question a), we have to write the equation of the cost (c) as a function of the minutes (m), so:
[tex]c_A=0.05\cdot m+20+20[/tex]In the equation above the term 0.05*m represent the 5 cents for minute then we have to sum the $20 for 250 texts and $20 of service fee.
Before we draw the lines, we can solve the question c). If a customer wants to spend $75 monthly we can recommen him the plan wich more minutes for that cost, so we need to calculate the minutes for each plan:
[tex]\begin{gathered} \text{For Plan A:} \\ c_A=75=0.05\cdot m+20+20 \\ 0.05\cdot m=75-20-20=35 \\ m=\frac{35}{0.05}=700 \\ \text{For Plan B:} \\ c_B=75=0.1\cdot(m-100)+15+20 \\ 0.1\cdot(m-100)=75-15-20=40 \\ m-100=\frac{40}{0.1}=400 \\ m=400+100=500 \end{gathered}[/tex]The customer should choose the Plan A, because it has more minutes and more texts for $75.
For point b), we can evaluate each equation in two differents m-values and found the pairs (m, c) to graph the lines, so:
[tex]\begin{gathered} \text{For Plan A, we can choose m=100 and m=500}\colon \\ m=100\Rightarrow c_{}=0.05\cdot100+20+20=45 \\ m=500\Rightarrow c=0.05\cdot500+20+20=65 \\ P_{1A}=(100,45),P_{2A}=(500,65) \end{gathered}[/tex][tex]\begin{gathered} \text{For Plan B, we can choose m=100 and m=500:} \\ m=100\Rightarrow c=0.1\cdot(100-100)+15+20=35 \\ m=500\Rightarrow c=0.1\cdot(500-100)+15+20=75 \\ P_{1B}=(100,35),P_{2B}=(500,75) \end{gathered}[/tex]And the graphs are:
In the Graphs we can see the lines intercept in m=300 and evluating the equations in that value the cost is $55.
Describe all of the transformations applied to the parent function f(x) = x² to sketch g(x) = 4(x – 2)² – 5
Answers
The transformations required are to shift the graph to the right by 2 units, shrink the graph by a factor of 4 and shift the graph downwards by 5 units.
The parent function given to us is f(x).The function f(x) equals x².We need to sketch the function g(x).The function g(x) equals 4(x – 2)² – 5.First of all, we need to graph x².Then, for the graph of (x – 2)², we need to shift the previous graph to the right by 2 units.Then, to obtain the graph for 4(x – 2)², we will shrink the graph by a factor of 4.Finally, to get the graph for 4(x – 2)² – 5, we will shift the graph in a downward direction by 5 units.Hence, we will obtain our final graph.To learn more about functions, visit :
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A candy stand sells lollipops, gumballs, and chocolates. The gumballs cost 5 cents more than the chocolates. The lollipops cost twice as much as the chocolates. A particular handful containing 3 gumballs, 2 lollipops, and 7 chocolates costs $2.11. What is the cost of each item?
Answers
The cost of lollipops, gumballs, chocolate is $ 0.268, $0.184, $0.134
What is an equation?
An equation is a formula that describes the equality between two expressions, by connecting them with the equals sign '='.
Let the cost of lollipops be x
The cost of gumballs be y
and cost of chocolates be z
We are given that the gumballs cost 5 cents more than the chocolates
mathematically this can be written as
[tex]y=z+0.05[/tex]
Similarly,
The lollipops cost twice as much as the chocolates
mathematically this can be written as,
[tex]x=2z[/tex]
Now finally we purchase 3 gumballs, 2 lollipops and 7 chocolates
The equation can be given as,
[tex]3x+2y+7z=2.11[/tex]
Substituting the values of x and y in this equation we get,
[tex]6z+2(z+0.05)+7z=2.11\\6z+2z+0.1+7z=2.11\\15z=2.01\\z=0.134[/tex]
The cost of chocolates is $0.134
The cost of gumballs is $0.184
And the cost of lollipops is $0.268
Hence, The cost of lollipops, gumballs, chocolate is $ 0.268, $0.184, $0.134
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The volumes, in ml, of olive oil can be modeled by a normal distribution, with mean 508 mL and standard deviation 12 ml.. a. Find the probability that a randomly selected bottle has a volume less than 500 mL. Round your answer to 3 significant figures. b. The probability that a randomly selected bottle has a volume greater than v mL is 0.366. Find the value of v.
Answers
A probability distribution that is symmetric about the mean is the normal distribution, sometimes referred to as the Gaussian distribution. It demonstrates that data that are close to the mean occur more frequently than data that are far from the mean. The normal distribution appears as a "bell curve" on a graph.
Explain the normal distribution with an example?
One straightforward example of anything that has a normal distribution pattern is height: The majority of people are normal height, although there are nearly equal numbers of people who are taller or shorter than average and a very small (but roughly comparable) number who are either extraordinarily tall or extremely short.
The four properties of a normal distribution are visible here. The mean, median, and mode are all equal in normal distributions, which are symmetric, unimodal, and asymptotically distributed.
Add the mean to the x value in step 1. Subtract the difference from the standard deviation in step two. A value of 1380 has a z-score of 1.53. Thus, 1380 is 1.53 standard deviations away from the distribution's mean.
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use the image to find angles Q & U. explain your reasoning.
Answers
Solution
Given
[tex]\begin{gathered} m<3=45^0 \\ m<1=50^0 \\ m<6=135^0 \end{gathered}[/tex][tex]\begin{gathered} m<6\text{ = m<1 + m<2 + m<3 \lparen corresponding angles are equal\rparen} \\ 135=50+m<2+45 \\ 135=95+m<2 \\ m<2=135-95 \\ m<2=40^0 \end{gathered}[/tex][tex]\begin{gathered} msolve for x. round to nearest tenth. angle DEF is an equilateral triangle. hyp is 24
Answers
Since the triangle DEF is an equilateral triangle and x is the height of this triangle, we can use the following formula for the height of an equilateral triangle:
[tex]h=\frac{l\sqrt[]{3}}{2}[/tex]Where 'l' is the length of the triangle side.
So, using l = 13, we have:
[tex]\begin{gathered} x=\frac{13\cdot\sqrt[]{3}}{2} \\ x=\frac{13\cdot1.73}{2} \\ x=11.2 \end{gathered}[/tex]So the value of x is 11.2
If f(x) = x^4 − x^3 + x^2 and g(x) = −x^2, where x ≠ 0, what is (f ⁄g)(x)?
Answers
The correct answer is
[tex](\frac{f}{g})(x)=-x^2+x-1[/tex]To solve this, first let's write the division:
[tex]f(x)=x^4-x^3+x^2,g(x)=-x^2\Rightarrow(\frac{f}{g})(x)=\frac{x^4-x^3+x^2}{-x^2}[/tex]Now we can factor out a x^2 on the top and the bottom of the expression:
[tex](\frac{f}{g})(x)=\frac{x^4-x^3+x^2}{-x^2}\Rightarrow(\frac{f}{g})(x)=\frac{x^2(x^2-x+1)}{x^2(-1)}[/tex]Now we can cancel out and divide by (-1), or the same thing, multiply by (-1):
[tex](\frac{f}{g})(x)=\frac{x^2(x^2-x+1)}{x^2(-1)}=-(x^2-x+1)=-x^2+x-1[/tex]Then the answer is (f/g)(x) = -x^2 + x - 1. That's the third option
CALCULATOR COLOR THEME Q Q 4. Find the area of the shaded region. 4 in. 8 in. 4 in 12 in
Answers
We are asked to determine the area of the shaded region. there are two squares, to determine the area we need to find the area of the outer rectangle and subtract the area of the interior rectangle. Let's remember that the area of a rectangle is the product of its sides. Therefore, the area of the outer rectangle is:
[tex]\begin{gathered} A_0=(8in)(12in) \\ A_0=96in^2 \end{gathered}[/tex]Now we find the area of the interior rectangle:
[tex]\begin{gathered} A_i=(4in)(4in) \\ A_i=16in^2 \end{gathered}[/tex]Now we subtract the areas:
[tex]A=A_o-A_i[/tex]Replacing:
[tex]\begin{gathered} A=96in^2-16in^2 \\ A=80in^2 \end{gathered}[/tex]Therfore, the area of the shaded area is
The figure below is a net for a triangular prism. What is the surface area of the triangular prism, in square feet?
Answers
The figure consists of,
A rectangle with dimension 15 ft by 7 ft.
Two triangles with base b = 7 ft and height h = 5 ft.
A rectangle with dimension 15 ft by 5 ft.
A rectangle with dimension 15 ft by 8.6 ft.
Determine the surface area of triangular prism.
[tex]\begin{gathered} A=15\cdot7+2\cdot\frac{1}{2}\cdot7\cdot5+15\cdot5+8.6\cdot15 \\ =105+35+75+129 \\ =344 \end{gathered}[/tex]So, surface area of triangular prism is 344 square feet.
Find the value of X and each arc measurex =mAD=mBC = mDC =mDBC=
Answers
The value of x can be calculated as,
[tex]\begin{gathered} \text{ summation of angles = 360}^{\circ} \\ 12x+90+(2x+5)+(17x-14)=\text{ 360}^{\circ} \\ 31x+95-14=360 \\ 31x=360-81 \\ 31x=279^{\circ} \\ x=\frac{279^{\circ}}{31} \\ x=9 \end{gathered}[/tex][tex]\begin{gathered} \text{mAD }=\text{ 12x} \\ =12\times9 \\ =108^{\circ} \end{gathered}[/tex][tex]\begin{gathered} \text{mBC}=(2x+5)^{\circ} \\ =(2\times9)+5 \\ =18+5 \\ =23^{\circ} \end{gathered}[/tex][tex]\begin{gathered} \text{mDC }=(17x-14)^{\circ} \\ =(17\times9)-14 \\ =153-14 \\ =139^{\circ} \end{gathered}[/tex][tex]\begin{gathered} \text{mDBC }=\text{ }(2x+5)^{\circ}+(17x-14^{})^{\circ} \\ =23^{\circ}+139^{\circ} \\ =162^{\circ} \end{gathered}[/tex]7.) Use the information to prove:
Given: The Diagram
Prove: EC AD
Answers
With the given information, we have proved that EC ≅ AD as corresponding sided of congruent triangles are congruent too.
What is congruent triangles?Both triangles are said to be congruent if the three angles and three sides of one triangle equal the corresponding angles and sides of the other triangle. We can see in the examples PQR and XYZ that PQ = XY, PR = XZ, and QR = YZ, and that P = X, Q = Y, and R = Z. Then, we can state that XYZ and PQR are related.
We have given that that ∠ADB = ∠ECB
And ∠ABC = ∠EBC as they are vertically opposite angles
And given that AB = EB
Thus, Triangle ABC ≅ Triangle EBC
And as ABC ≅ EBC
EC ≅ AD as corresponding sided of congruent triangles are congruent too.
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Decay (calculus problem)
Answers
Answer:
Step-by-step explanation:
If the half-life is k days, then you have
(1/2)^(300/k) = 0.696
k = 573.788
makes sense, since 69.6% is greater than 50%
Now solve for t in
(1/2)^(t/573.788) = 1/3
t = 909.432 days
makes sense -- about 1.5 half-lives
1. Provide a summary of the story “The Stone” Summarize the events in the exposition, rising action, climax, falling action, and resolution. Your written response should include 5 complete sentences.
Answer:
pls hurry
Answers
According to the plot synopsis for the novel "The Stone," a young homosexual guy experiences Taipei's nightlife, complete with all of its thrills and heartbreaks, perils, and hopes.
The Story of the Stone, sometimes referred to as "The Dream of the Red Chamber," was one of the finest books in Chinese literature when it was published about 1760. Gao E painstakingly edited and finished Cao Xueqin's majestic saga's fifth chapter, "The Dreamer Awakens," decades later.
The Story of the Stone has several references to or hints at the issue of the difference between what is true and what is untrue. The first volume in a five-volume series on the illustrious Chinese Jia family is titled "The Story of the Stone."
The major storyline chronicles the development of the love triangle between the three main characters—cousins Bao-yu, Dai-yu, and Bao-chai—as they grow up.
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Choose the expression that is equivalent to the one shown
Answers
1. Rewrite the expression to get the numerator and denominator with the same base:
[tex]\frac{(2^3)^{12}}{(2^2)^3}=\frac{2^{36}}{2^6}[/tex]2. Divide by leavinfg the same base and subtracting the exponents:
[tex]\frac{2^{36}}{2^6}=2^{36-6}=2^{30}[/tex]Write the result with base 4:
[tex]2^{30}=(2^2)^{30/2}=4^{15}[/tex]As you can see above any of the given expression is equivalent to the given expression.Answer: none of theseUse the figure to the right to name each of the following.1. A line2. A plane
Answers
ANSWER and EXPLANATION
We want to name a line and a plane.
LINE
In naming a line, we use two lettters. The two letters are the letters at the beginning and the end of the line.
Now, from the diagram, we have the following lines:
- nY
- Xm
- Zl
PLANE
A plane is made up of two lines intersecting one another.
In naming a plane, three letters are used, with the letter at the intersection in the middle.
The planes in the diagram are:
- mYn plane
- lRm plane
John recently joined a bowling team and each night plays three games. During his first two games he scored 112 and 134. What must John score on his last game to ensure his average for that night will be exactly 132?explain pls.
Answers
Let the score in his last game be
[tex]=x[/tex]The average of the three games is given as
[tex]=132[/tex]Step 1: The formula for average is
[tex]\text{average}=\text{ }\frac{\text{sum of the thre}e\text{ scores}}{3}[/tex]Step 2:Substituting the values of the three scores in the formula above, we will have
[tex]\begin{gathered} \text{average}=\text{ }\frac{\text{sum of the thre}e\text{ scores}}{3} \\ \text{average}=\frac{112+134+x}{3}=132 \end{gathered}[/tex]Step 3 : Cross multiply the equation below
[tex]\begin{gathered} \frac{112+134+x}{3}=\frac{132}{1} \\ \frac{246+x}{3}=\frac{132}{1} \\ 246+x=3\times132 \\ 246+x=396 \end{gathered}[/tex]Step 4: Subtract 246 from both sides
[tex]\begin{gathered} 246+x=396 \\ 246-246+x=396-246 \\ x=150 \end{gathered}[/tex]Hence,
John must score a point of 150 to ensure that his average is 132
Therefore,
Final answer = 150
In a rectangle the base measures (x + 7), height (x + 2), area = 36 cm
Calculate perimeter, height and base.
Answers
The values are given as;
Perimeter = 26cm
Height = 4cm
Base = 9cm
How to determine the valueThe formula for determining the area of a rectangle is expressed as;
Area = lw
Where;
l is the length of the rectanglew is the width of the rectangleNow, substitute the values into the formula, we have;
36 = (x +7)(x + 2)
Now, expand the bracket
36 = x^2 + 2x + 7x + 14
collect like terms
36 = x^2 + 9x + 14
Make into quadratic equation
x^2 + 9x + 14 -36 = 0
x^2 + 9x - 22 = 0
Factorize the equation
x^2 + 11x - 2x - 22 = 0
Factorize further
x(x + 11) - 2( x + 11) = 0
Then, x - 2 = 0, x = 2
or x + 11 = 0
x = -11
Height = x + 2 = 4cm
Base = x + 7 = 9cm
The formula for perimeter is expressed as;
Perimeter = 2( l +w )
Perimeter = 2( 4 + 9)
Perimeter = 2(13)
Perimeter = 26 cm
Hence, the values are 26cm, 4cm and 9cm respectively.
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6.5 in. 5 in 7.5 in. What is the total surface area of this prism in square inches?
Answers
6.5 in. 5 in 7.5 in. What is the total surface area of this prism in square inches?
we have that
the total surface area of a prism is equal to
SA=2B+Ph
where
B is the area of the base
P is the perimeter of the base
h is the height of the prism
Let
L=6.5 in
W=5 in
H=7.5 in
so
B=L*W=(6.5*5)=32.5 in2
P=2(L+W)=2(6.5+5)=23 in
H=7.5 in
therefore
SA=2(32.5)+23(7.5)
SA=237.5 in2
surface area is 237.5 square inchessee the attached figure to better understand the problem
the surface area is the area of its six rectangular faces
so
SA=2(6.5)8(5)+2((5)(7.5)+2(6.5)*(7.5)=237.5 in2
1.5.PS-9Question HelpError Analysis Simplify the expression - 1.8+(-1.2). On the test, when Tom simplified theexpression he got 0.6. What mistake did Tom likely make when he simplified the expression?- 1.8+(-1.2) = 1 (Type an integer or a decimal.)
Answers
Answer:
-3.0
Explanation:
First, we open the bracket and take note that:
[tex]+\times-=-[/tex][tex]\begin{gathered} -1.8+\left(-1.2\right)=-1.8-1.2 \\ =-3.0 \end{gathered}[/tex]Next, we determine Tom's mistake.
[tex]\begin{gathered} 1.8+(-1.2)=1.8-1.2 \\ =0.6 \end{gathered}[/tex]Therefore, the mistake Tom made was that he ignored/forgot the negative sign before 1.8.
7/8 ^2
Choose the correct expanded form for the following expression .
Evaluate 7/8^2
Answers
The correct expanded form for the following expression is 7/8 × 7/8.
What is expanded form?The division of numbers into their component ones, tens, hundreds, thousands, ten thousand, and so forth creates the expanded form of the number. The expanded version of the number is the sum of each digit times its place value, which is used to represent the number. A number is broken down to show the value of each of its digits in order to be written in expanded form. 144 would then be converted to 100 + 40 + 4 = 144. It can be used to compute sums as well. When a number is expanded to show the value of each digit, it is written in expanded form. The numerical value of each digit in the number we are writing is represented using extended form.
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Use the slope-intercept form of the linear equation to write the equation of the line with the given slope and v-intercept Slope - 9. y-intercepto 0.-)
Answers
the equation of the line will be
[tex]y+\frac{7}{9}=-9x[/tex]then subtracting 7/9 in both sides we have
[tex]y=-9x-\frac{7}{9}[/tex]which is the line equation in slope intercept form.
The slope-intercept equation of a line is y= 4x-1. What is the slope of the line?
OA. The slope is 4.
OB. The slope is -4.
OC. The slope is -1.
OD. The slope is 1.
Answers
The y-intercept is (0,-1)
I hope this helps because you didn’t say which one you needed.
the slope is 4 since it is the number beside the x
-10+*+5> 7-5
3
3. Here is an inequality:
What value of x will make the two sides equal?
35 225
4
Answers
Fraction, A number that is stated mathematically as a quotient, where the numerator and denominator are divided. Both are integers in a simple fraction. A fraction appears in the numerator or denominator of a complex fraction. The numerator of a proper fraction is less than the denominator.
What is denominator?A fraction is a portion of a whole or, more broadly, any number of equal parts. In everyday English, a fraction describes the number of parts of a specific size, such as one-half, eight-fifths, or three-quarters. The denominator is simply the bottom number.
-10+*+5>7-5 justification
-10+*+5> 7-5
Step 1:
Multiply
-10 * 5 = -50.
Step 2:
Subtract:
7 - 5 = 2
the result of step No. 1 > the result of step No. 2
= -50 > 2 = No
The result:
-10 * 5> 7 - 5 = No
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3) Triangle ABC is dilated by a scale factor of 4 to form triangle A'B'C'. Wha-are the coordinates of vertex A'? Make sure that you enter the coordinatesin the form of (x, y) below. *Your answer
Answers
Answer
A' (-8, 4)
Explanation
When a figure, that is on the coordinates system is dilated (that is, enlarged or reduced) with respect to the origin, the new coordinates of its edges is simply a product of its old coordinates and the scale factor.
For this question, the coordinates of A is (-2, 1) and the dilation of the triangle ABC is by a scale factor of 4.
So, the new coordinates of A will be calculated thus
A (x, y) = A' (x × scale factor, y × scale factor)
A (-2, 1) = A' (-2 × 4, 1 × 4) = A' (-8, 4)
Hope this Helps!!!
/ Week 1 / Week 1 Monday - Daily Quiz
A rectangle is 5 feet long and 12 feet wide.
What is it's area?
Answers
60 feet² is the area of rectangle.
What is rectangle?
A rectangle is a sort of quadrilateral with parallel sides that are equal to one another and four vertices that are all 90 degrees apart. As a result, it is sometimes referred to as an equiangular quadrilateral. Rectangles can also be referred to as parallelograms because their opposite sides are equal and parallel.The four sides of a laptop are equal in length and have opposite sides that are parallel to one another.length = 5 feet
wide = 12 feet
area of rectangle = length × width
= 5 × 12
= 60 feet²
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which measurement is closest to the volume of the container in cubic inches
Answers
The volume of a cylinder is given as;
[tex]\begin{gathered} Vol=\pi\times r^2\times h \\ r=3 \\ h=10.5 \\ \text{Vol}=3.14\times3^2\times10.5 \\ Vol=3.14\times9\times10.5 \\ \text{Vol}=296.73in^3 \end{gathered}[/tex]Therefore, from the options provided, the closest to the volume of the container is 296.88 cubic inches.
Option B is the correct answer
K
Find the average rate of change of the function f(x) = 6x from x₁ = 0 to x₂ = 3.
The average rate of change is
(Simplify your answer.)
Answers
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How do you find the average rate of change of
f
(
x
)
=
2
x
2
+
1
on [x,x+h]?
Calculus Derivatives Average Rate of Change Over an Interval
1 Answer
Steve M
Feb 28, 2017
4
x
+
2
h
Explanation:
The average rate of change of a continuous function,
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a
,
b
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is given by
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on
[
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f
(
x
+
h
)
−
f
(
x
)
(
x
+
h
)
−
(
x
)
=
f
(
x
+
h
)
−
f
(
x
)
h
...
.
.
[
1
]
=
2
(
x
+
h
)
2
+
1
−
(
2
x
2
+
1
)
h
=
2
(
x
2
+
2
x
h
+
h
2
)
+
1
−
2
x
2
−
1
h
=
2
x
2
+
4
x
h
+
2
h
2
−
2
x
2
h
=
4
x
h
+
2
h
2
h
=
4
x
+
2
h
Which is the required answer.
Additional Notes:
Note that this question is steered towards deriving the derivative
f
'
(
x
)
from first principles, as the definition of the derivative is:
f
'
(
x
)
=
lim
h
→
0
f
(
x
+
h
)
−
f
(
x
)
h
This is the function we had in [1], so as we take the limit as
h
→
0
we get the derivative
f
'
(
x
)
for any
x
, This:
f
'
(
x
)
=
h
→
0
4
x
+
2
h
=
4
x
this is a example
It was recently estimated that females outnumber males by about three or two. If there are 1770 people in a county, how many of them are females?
Answers
GIVEN
1) Females outnumber males by 3 to 2.
2) There are 1770 people in the city.
SOLUTION
Let the number of males be x and the number of females y. Therefore, the total number of people can be written to be:
[tex]x+y=1770\text{ -----------(1)}[/tex]If there are 3 females for every 2 males, we have that:
[tex]\begin{gathered} \frac{y}{3}=\frac{x}{2} \\ \therefore \\ x=\frac{2y}{3}\text{ ----------(2)} \end{gathered}[/tex]We can substitute equation (2) into equation (1) and solve for y:
[tex]\begin{gathered} \frac{2}{3}y+y=1770 \\ \frac{2y+3y}{3}=1770 \\ 5y=1770\times3 \\ 5y=5310 \end{gathered}[/tex]Dividing both sides by 5, we have
[tex]y=1062[/tex]There are 1062 females in the county.
Look at the following equation:
12,400 × [] = 1,240
What number should go in the box to make the equation true? (1 point)
1/10
1/100
10
100
