If you are asking if your work is good,thn yes,you are right
I think you mean 48. 4 * x = 48. x = 48/4 = 12
4-1/2x=10
-1/2x=6
3
so your answer would be B
hope that helps
Answer:
11in
Step-by-step explanation:
a^2+b^2=c^2 when c is the hypotenuse
10^2+sqrt21^2=c^2
100+21=c^2
121=c^2
11=c