Combine like terms.
9 + 3x – 9x + 16
a.
3x + 16
b.
19x
c.
18x + 3x + 16
d.
25 – 6x

An arrow is shot vertically upward at a rate of 180ft/s. use the projectile formula h=−16t2+v0t to determine at what time(s), in seconds, the arrow is at a height of 420ft. round your answer(s) to the nearest tenth of a second.

Solve with work both bert and ernie received an increase in their weekly salaries. bert's salary increased from $520 to $520. ernie's salary went from $580 to $645. find the percent of increase for each salary. what was the larger of the two percents ?

Olga used 100 ounces of flour to make 225 muffins. how many ounces of flour will be used to make 300 muffins?