Could someone please answer this I really need help.

The angles are...
(x+20)
(4y)

x = 40

y = 15

Step-by-step explanation:

equilateral triangle: all angles = 60

4(15) = 60

40 + 20 = 60

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.

the radius is 2 times the diameter.

step-by-step explanation: