Answer:
15
Step-by-step explanation:
a²+20²=25²
a²=625-400
a²=225
a=15
I am not sure if you have any questions or need any further information on this
Answer:
Step-by-step explanation:

3x+8=5x-1
3x-5x=-1-8
-2x=-9
x=4,5
AM=3x4,5+8=21,5
MB=5x4,5-1=21,5
AB=AM+MB
AB=21,5+21,5=43
Answer:
22 pi cm ( 69.12 cm)
Step-by-step explanation:
pi * d = circumference = pi * 2 * r = pi * 2 * 11 = 22pi cm