Factor this expression completely. -21x+28
A 7(3x-4)
B -7(3x-4)
C -7(3x+4)
D -(21x-4)

Find parametric equations for the line. (enter your answers as a comma-separated list of equations. let x, y, and z be functions of t.) the line in the direction of the vector 5 i + 5 j − 6k and through the point (−4, 4, −2).

Two blends of tea are mixed to make a blend that will be sold at the fair. black tea sells for $2.20 per pound and orange pekoe tea sells for $3.00 per pound. how much of each should be used to obtain a 4lb blend selling for $2.50 per pound?

He concluded that a heavier object dropped from the same height as a lighter object will land