Answer this 20 points and brainliest! only if you understand it, .

C

Step-by-step explanation:

The cakes which overlap are the small and middle & the middle and large. The total area of overlap for these cakes will be the surface of the smallest layer's base plus the surface of the middle layer's base.

We can find the area by where r is radius which is half the diameter.

Smallest cake - D=7.5, so r=3.75

=10.5625 × π = 33.1830724035 or 33.2

Middle Cake - D=10, so r=5.

=25 × π = 78.5398163397=78.5

We add together 33.2+78.5= 111.7 cm squared

C is the closest.

x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x

step-by-step explanation:

last month maria hiked the 5-mile mountain trail a number of times and she hiked the 10-mile canal trail several times. let x represent the number of times she hiked the 5-mile trail, and let y represent the number of times she hiked the 10-mile trail. if she hiked a total of 90 miles, which equation can be used to find the number of times maria hiked each trail? x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x