Answer:
7.1
Explanation:
you use the Pythagorean theorem to solve this problem. a^2+b^2=c^2.
you are finding value of b plug the variables in = 7^2+b^2=10^2
=49+b^2=100
subtract 49 from both sides
b^2=51
Square root of 51 =7.141 round to nearest tenth =7.1