Given the directrix of y = 4 and focus of (0, 2), which is the equation of the parabola?

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.

What is the logarithmic function modeled by the following table? x f(x) 9 2 27 3 81 4

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?