What is the right answer?

Given tan∅=4/3 and π< ∅< (3π)/2; find cos2∅ a. -24/25 b. 24/25 c. -24/7 d. -7/25

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

Find the solution(s) to the system of equations. select all that apply y=x^2-1 y=2x-2