Which expression has a value of 13?

(12+6)÷3+3

12+(6÷3+3)

(12+6)÷(3+3)

12+6÷(3+3)

Which statement about the graph of y = 8(0.25)^2

Find the measure of the interior angles of the following regular polygons: a triangle, a quadrilateral, a pentagon, an octagon, a decagon, a 30-gon, a 50-gon, and a 100-gon.

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