Find the hypotenuse c of the right triangle with the given side lengths a and b. Round your answer to the nearest tenth.
1. a = 15, b = 20
2. a = 5, b = 12
3. a =
a = 13, b = 84
4. a = 65, b = 72
5. a = 6, b = 17.5
6. a = 62.b = 7