Andres completed a 5-km race in 13.5 minutes. his sister’s time was 1 and 1/2 times longer than his time. how long, in minutes, did it take his sister to run the race?

20.25 minutes.

Step-by-step explanation:

We have been given that Andres completed a 5-km race in 13.5 minutes. His sister’s time was 1 and 1/2 times longer than his time.

To find time taken by Andres's sister, we will multiply 13.5 by 1 and 1/2.

Therefore, it will take Andres's sister 20.25 minutes to run the race.

60

step-by-step explanation:

every triangle measures a total of 120 degrees. you have to find angle c. we know that isosceles triangles angles are equal. 60 degrees plus 60 degrees gives you 120.

step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15