Are 1/2 and 12/24 and 13/26 equivalent?

If x = -2, then x 2-7x+10 equals a. 0 b.20 c.28

Point r divides in the ratio 1 : 3. if the x-coordinate of r is -1 and the x-coordinate of p is -3, what is the x-coordinate of q? a. b. 3 c. 5 d. 6 e. -9

Olga bought a new skirt that cost $20. sales tax is 5%. how much did olga pay, including sales tax? 7.