Who wants to be my friend? i have a relly nice friend already from here!

What is the area of triangle abc if a = 8, b = 11, and c = 15?

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.

Write the equation for the parabola that has x− intercepts (−2,0) and (4,0) and y− intercept (0,4).