Answer:
10
Step-by-step explanation:
hxbcjxjxjdjhdhhdbxbeeu10
4) 12inches over 1 foot I think. So like 12in/1ft
A^2+b^2=C^2
13^2+b^2=21^2
169+b^2=441 collect the like terms
b^2=441-169
b^2=272 get the square root of b and 272
b=16.492422
b=16.5 choice B