What expression is equivalent to -21?
A. 9-(-12)
B. 9+(-12)
C. -9+12
D. -9-12

Simplify 15(x - 4)(x -1)-3(x + 4)(x - 1) with steps

Offering 30 if a plus b plus c equals 68 and ab plus bc plus ca equals 1121, where a, b, and c are all prime numbers, find the value of abc. the answer is 1978 but i need an explanation on how to get that.

You have a square piece of cardboard that measures 14 inches on each side. to build a box, you cut congruent squares out of each corner of the cardboard. use the picture to find the area of the cardboard you were used to build the box