Answer:
1. Sails come in many shapes and sizes. Is the Sail on the right a right?

No, it is not.
2.
Using the Pythagorean theory

The possible values of the legs satisfy the equation above, where a and b are diffent from zero.
3.
The diagonal of a rectangular prism is: 

4.
The ladder lengh is 9 foot: triangle hypotenuse
Distance between the ladder base and bottom of tree is 4 feet: triangle leg
5.

Hi! I believe the answer you are looking for is:
2 + x/5
"Sum" means addition.
"Quotient" means division.
Hope this helps you!
The answer is B) which is letter E . hope this helps <3