Simplify each of the following
4.1.1 13a2 - 3b - 21a2 + 76​

Which expression is equivalent to 2x^2+2x-4/2x^2-4x+2

What is 20+(5 x 2/5 )+ 3 show your work

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.