seven runners compete in a race in, in how many ways can first, second, and third place be awarded?

a) 210.
b) 840.
c) 5040.
d) 30,240.

The polynomial 10x3 + 35x2 - 4x - 14 is factored by grouping. 10x3 + 35x2 - 4x - 14 5x )-20 what is the common factor that is missing from both sets of parentheses?

Aladder that is 20 ft. long against the side of a building. f the angle formed between the ladder and the ground is 75 degrees, how far is the bottom of the ladder from the base of the building?

Which are the possible side lengths of a triangle?