What are the non permissible values of (5a^2 + 80a)/50ab^2

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

Pls math have no ideamultiply and simppify. 2x^2y^3z^2 • 4xy^4x^2

Caitlin had 402. in her bank account. she withdrew $15.each week to pay for swimming lesson. she now has $237.