(3m + 2n - 6) and (-4 - 6m + 7n). What expression shows is equivalent to the sum of the two expressions written in standard form?

Write a story that matches with the expression 42x-5 pls hurry

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.

Marina baked cookies. she gave 3/4 of the cookies to the scout bake sale. she shared the remaining 6 cookies with her friends. how many cookies did marina bake?