Answer:
1. b=6
2.b=8
3.a=30
I can't get the correct answer for 4 and 5 hope what I've got so far helps.
Explanation:
1. 8^2+b2=10^2
64+b2=100
b2=36
then square to get
b=6
2. 15^2+b2=17^2
225+b2=289
b2=64
then square to get
b=8
3. a2+40^2=50^2
a2+1600=2500
a2=900
then square to get
a=30
I can't get the correct answer for 4 and 5 hope what I've got so far helps.