How many reading questions do i need to get correct to go up from a 620 to a 700?

Find the value of the variable and the length of each secant segment.

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*