-8x + 7y = -2
&x – 7y = 2 how many solutions

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

Over which interval is the graph of f(x) = x2 + 5x + 6 increasing?

In the diagram, a building cast a 35-ft shadow and a flagpole casts an 8-ft shadow. if the the flagpole is 18 ft tall, how tall is the building? round the the nearest tenth.