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Alex17521 [72]
3 years ago
5

A runner ran 25 miles last week and 15 miles this week. What is the percent of change

Mathematics
2 answers:
Ede4ka [16]3 years ago
8 0

Answer:

40%

Step-by-step explanation:

The change in percent is the difference of the two distances ran divided by the last week’s distance and the result multiplied by 100%

That’s

25 - 15 / 25 x 100%

10/25 x 100%

0.4 x 100%

40%

The percentage change 40%

nikdorinn [45]3 years ago
4 0

Answer:

21.25 or 28.75

Step-by-step explanation:

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A car wheel is 56 cm in diameter. A. How far does the car go in one revolution of the wheel?
andre [41]

The car moved 175.84 cm in one revolution

The car has moved 17584 cm in 100 revolutions

<em><u>Solution:</u></em>

Given that car wheel is 56 cm in diameter

diameter = 56 cm

To find: distance traveled in one revolution of wheel

Usually wheel is of circular shape

one revolution of wheel = circumference of circle

<em><u>The circumference of circle is given as:</u></em>

c = 2 \pi r

We know that,

diameter = 2(radius)

d = 2r

<em><u>So the circumference becomes:</u></em>

c = \pi d

substitute \pi = 3.14 and d = 56 cm

c = 3.14 \times 56 = 175.84

Thus the car moved 175.84 cm in one revolution

<em><u>B. How far does it go in 100 revolutions</u></em>

Distance covered in 100 revolutions = 100 x Distance covered in 1 revolution

\rightarrow 100 \times 175.84 = 17584

Thus the car has moved 17584 cm in 100 revolutions

6 0
4 years ago
(8,y) and (-2,4);slope =-1/5
Ivan

Answer:

y = 2

Step-by-step explanation:

Calculate the slope m and equate to - \frac{1}{5}

m = \frac{y_{2}-y_{1}  }{x_{2}-x_{1}  }

with (x₁, y₁ ) = (- 2, 4) and (x₂, y₂ ) = (8, y)

m = \frac{y-4}{8+2} , that is

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Multiply both sides by 10 to clear the fractions

y - 4 = - 2 ( add 4 to both sides )

y = 2

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