Mathematics High School

a runner ran tow laps around a 400m track. she completed the first lap in 50 seconds and then decreased her speed by 5% for the second lap. find:

A) her total time for the two laps

B) her average speed for the two laps


Please helppp! ​

Answers

Answer 1

Answer:

Step-by-step explanation:

Her average speed for the first lap is 8m per second. Her speed for the second lap is about 7.6m per second. So her total time for the two laps is 1 minute and 42 seconds.

Related Questions

what is not true about unit rates?

Answers

Answer:

One thing that is not true would be:

There isn't a 1 in a unit rate

Step-by-step explanation:

There is actually a 1 (specifically in the denominator) because the word unit means 1

Hope this helps :)

Before soccer practice, Laura warms up by jogging around the outside of the entire soccer field. Measures 80 Meters by 120meters. If Laura wants to know how much Meters she jogged in all, which measurement should she find?

Answers

Answer:200

Step-by-step explanation: length plus hight

mko

What is the value of the expression below when z = 3?

2
6z + 2z + 10

(Pls help asap!)

Answers

Answer:

1

Step-by-step explanation:

The midpoint of AB
is M(4, -1)M(4,−1). If the coordinates of AA are (2, 5)(2,5), what are the coordinates of BB?

Answers

this is step by step i think this is correct

ALG 2
y = -7x
sub y for 4 and solve for x

Answers

Answer:

x = -4/7

Step-by-step explanation:

y = -7x

4 = -7x

Switch Sides

-7x = 4

Divde both sides by -7

-7x/-7 = 4/-7

Simplify

x = -4/7

The scale on a map of Pennsylvania is 1/2 inch = 10 miles. The distance from Allentown to Harrisburg is about 75 miles. How far apart are the cities on the map?

Answers

Answer: 3 1/2 inches apart

Step-by-step explanation:

first correct answer will be marked as brainiest please help fast

Answers

Answer:

i think 180 degrees is the right answer

Angle A = x + 20

Angle B = x

Therefore, x + x + 20 = 180 (as given in question)

= 2x + 20 = 180

= 2x = 180 -20 (Transposing 20 from LHS to RHS)

= 2x = 160

x = [tex]\frac{160}{2}[/tex] ( Transposing 2 from LHS to RHS)

= 80

Answer : Angle A = 80 degrees

               Angle B = 80 + 20 = 100 degrees

what is the value of x for which
3/4=x/12​

Answers

Answer:

the value of x will be 9

x = 9

Sally finished 3/4 of the marathon she ran in 9 hours. How long was the Marathon

Answers

Answer:o.75 you need to divide

Step-by-step explanation:

Which angles are supplementary to each other?

Answers

Answer:

dea/ced

Step-by-step explanation:

Answer:

∠DEA and∠ CED

Step-by-step explanation:

supplementary angles are angles that when added together the add up to 180 degrees

the answer would be :

∠DEA and ∠CED

Combine like terms.
4x-8y-2x+5y+x

Answers

Answer:

3x - 3y

Step-by-step explanation:

Step 1: Write expression

4x - 8y - 2x + 5y + x

Step 2: Combine like terms (x)

4x - 2x + x = 3x

3x - 8y + 5y

Step 3: Combine like terms (y)

-8y + 5y = -3y

3x - 3y

Help me pleaseeeeeeeeeeeee

Answers

Answer:

B. perpendicular

Step-by-step explanation:

hope this helps

Rewrite the equation by completing the square.
4x^2-4x+1=0

Answers

Answer:

[tex]4x^{2} -4x+1=0\\4x^{2} -2x-2x+1 =0\\2x(2x-1)-1(2x-1)=0\\(2x-1)^{2} = 0\\\\x = \frac{1}{2} or\\x= -\frac{1}{2}[/tex]

The lowest elevation in Long Beach, California, is 7 feet below sea level. The elevation of Death Valley is about 40 times lower than the elevation of Long Beach. What is the approximate elevation of Death Valley?

Answers

Answer:

-280

Step-by-step explanation:

10^a x 10^b can someone help? I have to simplify

Answers

Answer:10^a+b hope this helps []~(￣▽￣)~*

Step-by-step explanation:

PLZ HELP BRAINLIEST, THANKS, 5 STARS

Answers

Answer:

437.5

Step-by-step explanation:

y = .8x +250

600 = .8x + 250

350 = .8x

437.5

adrian can walk 3 miles in 9 minutes x, need this solved asap

Answers

Answer:

Wow, thats fast! He walkes a mile every 3 minutes.

Step-by-step explanation:

In the equation y=5x, what is the value of M?​

Answers

Answer:

5

Step-by-step explanation:

In a general linear function, the formula is this: y = mx + c, where m is the gradient and c is the y-intercept.

The larger of two numbers is 7 more than 5 times the other. Their sum is 55. Find the two numbers.

Answers

Answer:

Step-by-step explanation:

8 and 47

a foot is 12 inches. a yard is 3 feet. what fraction of a yard is 8 inches

Answers

Answer:

8/36

Step-by-step explanation:

12 inches =1 foot

1 yard=3 feet

3feet=36 inches

Answer:

2/9

Step-by-step explanation:

What is the answer to this eqaution 20 ÷ 15/16

Answers

Answer:

21 1/3

Step-by-step explanation:

20 ÷ 15/16=

20/1 ÷ 15/16=

20/1*16/15=

4/1*16/3=

64/3=

21 1/3

One number is three times another number. If their sum is 52, what are the numbers?

Answers

Answer:

13*3+13=52

Step-by-step explanation:

13*3=39

39+13=52

The unknown number will be equal to 13.

What is an expression?

The mathematical expression combines numerical variables and operations denoted by addition, subtraction, multiplication, and division signs.

Mathematical symbols can be used to represent numbers (constants), variables, operations, functions, brackets, punctuation, and grouping. They can also denote the logical syntax's operation order and other properties.

Given that one number is three times another number and their sum is 52. The number will be calculated as,

3n + n = 52

4n = 52

n = 52 / 4

n = 13

Hence, the unknown number is 13.

To know more about an expression follow

https://brainly.com/question/14499363

#SPJ2

Are points A,B,and E Collinear or noncollinear

Answers

Answer:

non colinear

Step-by-step explanation:

Colinear means in a line

ABE are not in a line

Answer:

A.  noncollinear

Step-by-step explanation:

ABE are NOT in the same  line

The range of a set of numbers is 15 1/4
The smallest number is -2 7/8
Work out the largest number.

thos are fractions btw​

Answers

answer = (+/-) 12.375

hi can i have some help pleaseeeee!!

Answers

Answer:

$20 an hour 800 divide by 40 hours

Answer:

$20

Step-by-step explanation:

$800 for 40 hours

To find pay per hour, you must divide the money by the number of hours:

$800/40 hours = $20 an hour

subtract 3 from the cube of f​

Answers

Answer:

f^3-3

Step-by-step explanation:

Hope this helps u

Crown me as brainliest:)

Simplify the following:
(4x2+ 7x + 8) - (-3x3 + 5x + 2)
What did you do to get this answer

Answers

Answer:

beuwhwvd

Step-by-step explanation:

Multiply 613 by the reciprocal of −716.

Answers

Answer:

-613/716.

Step-by-step explanation:

The reciprocal of a number is basically that number upside down. to find the reciprocal of a whole number, you can just turn the number into a fraction, and put one as the numerator, and the original number as the denominator. given this information we know that the reciprocal of -716 is -1/716, so now yoj can simply cross multiply 613 by -1/716, which gives you -613/716.

a climber starts descending from 540 feet above the sea level and keeps going until she reaches 20 feet below sea level.How many feet did she descend?

Answers

Answer: -520

Step-by-step explanation: rather than 540-20 you'll do 20-540 and get -520 plus it's below sea level, so you know it's a negative

Right answer please.

Answers

Answer:

[tex]32 + 8 \sqrt{10} [/tex]

Step-by-step explanation:

Segment XM= 24

d=

[tex] \sqrt{(x2 - x1) ^{2} + (y2 - y1) ^{2} } [/tex]

[tex]d = \sqrt{(24 - 0) ^{2} + ( - 3 + ( - 3)) {2}^{?} } [/tex]

[tex]d = \sqrt{24 ^{2} + 0 ^{2} } [/tex]

[tex]d = 24[/tex]

Segment XK=8

[tex]d = \sqrt{(x2 - x1) ^{2} + (y2 - y1) ^{2} } [/tex]

[tex]d = \sqrt{(0 - 0) ^{2} + (5 - ( - 3))^{2} } [/tex]

[tex]d = \sqrt{(0 )^{2} + 8^{2} } [/tex]

[tex]d = \sqrt{64} [/tex]

[tex]d = 8[/tex]

Segment KM=

[tex]d = \sqrt{ {(0 - 24)}^{2} + {(5 - ( - 3))}^{2} } [/tex]

[tex]d = \sqrt{ { - 24}^{2} + {8}^{2} } [/tex]

[tex]d = \sqrt{576 + 64} [/tex]

[tex]d = \sqrt{640} [/tex]

[tex]d = 8 \sqrt{10} [/tex]

Perimeter = the length of all 3 segments.

[tex]p = 8 + 24 + 8 \sqrt{10} [/tex]

[tex]p = 32 + 8 \sqrt{10} [/tex]

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