What is the measure of an angle if its two rays share the same points and coincide

Use the elimination method to find the solution to the system of equations. 2x - 3y = -9 -x + 3y = 6

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

Agarden consists of an apple tree, a pear tree, cauliflowers, and heads of cabbage. there are 40 vegetables in the garden. 24 of them are cauliflowers. what is the ratio of the number of cauliflowers to the number of heads of cabbage?