Write the formula for the Pythagorean Theorem and use it to find the value of a. Round your answer to the nearest tenth, if necessary.

Answer:
Step-by-step explanation:
c=a2+b2−−−−−−√
a=172+152−−−−−−−−√
c=289+225−−−−−−−−√
c=514−−−√
c=22.6716
c²= 22.7