Let x be the time she ran and y be the time she walked

then distance ran = 25x and distance walked = 5y

so 15x + 5y = 42

and x + y = 4

* second equn. by -5:-

-5x - 5y = -20

add this to the first equn:0

10x = 22
x = 2.2

distance she ran = 2.2 * 15 = 33 km

7 0

3 years ago

If R is the midpoint of QS, RS= 2x-4, ST=4x-1, and RT=8x-43 Find QS

frosja888 [35]

Answer:

Step-by-step explanation:

8 0

3 years ago

What is 2 times pi times r? pi is 3.14 or 22/7. What is r?

Ludmilka [50]

"2 times pi times r", which can be written as "2*pi*r", represents the circumference of a circle. This is the distance around the circle (aka perimeter)

r is the radius of the circle

if you know the diameter then you can divide the diameter in half to get the radius (example: diameter is 10 so the radius is 5)

7 0

3 years ago

Read 2 more answers

Solve the triangle. Round your answers to the nearest tenth.

butalik [34]

The missing information of the triangle is C = 63°, b ≈ 28.084 and c ≈ 25.084. (Correct choice: C)

<h3>How to determine the missing sides and angles</h3>

In this question we have a triangle with a known side lengths and two known angle measures. First, we find the missing angle by Euclidean geometry:

C = 180° - 94° - 23°

C = 63°

Lastly, we determine the missing sides by law of sines:

$b = 11 \times \frac{\sin 94^{\circ}}{\sin 23^{\circ}}$

b ≈ 28.084

$c = 11 \times \frac{\sin 63^{\circ}}{\sin 23^{\circ}}$

c ≈ 25.084

The missing information of the triangle is C = 63°, b ≈ 28.084 and c ≈ 25.084. (Correct choice: C)

To learn more on triangles: brainly.com/question/2773823

#SPJ1

8 0

2 years ago