Which equals the product of (x – 3)(2x + 1)?

2x2 – 7x – 3
2x2 – 5x – 3
3x – 2
6x2

Me because some of question i don’t understand

Which shows one way to determine the factors of 4x3 + x2 – 8x – 2 by grouping?

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 between 80 and 120.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 between 80 and 120.