Solve the system by elimination. 3x - 3y + 6z = 15
3x + y - 3z = -5
23x-y-6z = 0
The solution is

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ab=9, and ac=12, find hc.

Which expression is equivalent to 8(k + m) − 15(2k + 5m)?

G. how many different 6-letter arrangements can be formed using the letters in the word absent, if each letter is used only once? a. 6 b. 36 c. 720 d. 46,656