How are 1/4 of 12 and 12 divided by 4 related

When i add money am i supposed to make it like this 7+12 or 7.00+12.00 because i got 19 dollars for my answer

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

Which best describes the function on the graph? direct variation; k = −2 direct variation; k = -1/2 inverse variation; k = −2 inverse variation; k = -1/2