Answer:
Step-by-step explanation:
x=9
x+16=9+16
x+16=25
tis just a plain vanila multiplication
(3·x)·7 -> 21x.
0.35i think if not please correct me
4.71
Arc length = 2*pi*r-(pi*r)/2
Arc length = 3*2*(3.14)/4 = 4.71