Peter says, "If you subtract 12 from my number and multiple the difference by -7, the result is -189" what is peter's number

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?

Solve the inequaliy: (x^2+2)(x−2)^2(6−2x)> 0

The distribution of a sample of the outside diameters of pvc pipes approximates a symmetrical, bell-shaped distribution. the arithmetic mean is 14.0 inches, and the standard deviation is 0.1 inches. about 68% of the outside diameters lie between what two amounts?