How can i write this as a fraction in simplest form.×4/7 5/2

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

Which statement shows that 6.24 is a rational number? a. 6.24 = 6.242424 b. 6.24 = 6.24 c. 6.24 = 68⁄33 d. 6.24 = 66⁄25

What are two numbers that add up to -9 and multiply to -10 best answer gets branliest and 100 extra points