HAVE A NICE DAY
WILL GIVE BRAINLST :)

Answer:
See below for answers and explanations
Step-by-step explanation:
Problem 1:
a²+b²=c²
4²+5²=c²
16+25=c²
41=c²
√41=c
c=√41
Problem 2:
a²+b²=c²
15²+b²=25²
225+b²=625
b²=400
b=20
Problem 3:
a²+b²=c²
a²+48²=60²
a²+2304=3600
a²=1296
a=36