Answer:

Step-by-step explanation:
Take out 4:
4(x^2-8x)-12
=4(x^2-8x+16-16)-12
=4(x^2-8x+16)-64-12
=4(x^2-4)^2 - 76
=
Answer:
a
Step-by-step explanation:
Answer: 132 degree
Step-by-step explanation:
X + 48 = 180
X = 180 - 48
X = 132 degree
The mass of the rock in kg is 90,000 kg