3:2 because 18/12 and 30/20 both reduce to 3/2
15/20
convert to a decimal
0.75
multiply 0.75 by 100 to convert to a percentage
0.75 * 100
simplify 0.75 * 100
your answer is 75%
Step-by-step explanation:
(x + 8)(x - 1) = x^2 - x + 8x - 8 = x^2 + 7x - 8.
Hence a = 1, b = 7, c = -8. (Options A, D and E)