Answer:
Step-by-step explanation:
What two number multiply to equal 6*(-12) and add to equal -1? That is -9 and +8.

Now factor by grouping

Answer:
160
Step-by-step explanation:
LxWxH divided by 2
8x8x5=320
320/2=160
3,941.04 i think is right
Answer:
a = 33 degrees
Step-by-step explanation:
Note that 57 degrees and Angle a are complementary: they add up to 90 degrees.
Thus, a = 90 degrees less 57 degrees = 33 degrees
19 . Prob( 2 reds) = 1/2 * 25/51 = 25/102
20. This would be 15C12 = 15C3 = (15*14*13) / (3*2*1) = 455