Subtract:
4x^3 − 6x^2+8x − 9 from 7x^3 − 16x + 18

also:
from the sum of a^2 − 2ab + b^2 and 2a^2 + 2ab + b^2 subtract the sum of a^2 − b^2 and a^2 + ab + 3b^2

Use the quadratic formula to solve the equation. if necessary, round to the nearest hundredth. x^2 - 20 = x a. 5, 4 b. -5, -4 c. -5, 4 d. 5, -4

Assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq less than 132. the probability that a randomly selected adult has an iq less than 132 is?

Find 63% of 77. a. 0.485 b. 48.5 c.0.818 d.81.8