1) 8
2) 14.5*2=29
3) 7x+5=2*13, 7x+5=26, 7x=21, x=3
4)d(1)=2r,
if r increase 3 times, d(2)=2*(3r)
d(2)/d(1)=(2*3r)/2r=3,
so diameter increases 3 times
$69.64 I THINK IS HOW MUCH SHE WILL HAVE TO PAY.
HOPE THIS HELPS
12 is the answer because you subtract 8 from 20