Because a triangle's angles need to equal 180, you can subtract 100(30+70) and you will get 80. So 80 will be your third angle.
Answer:

Step-by-step explanation:
1) Simplify 1/3 ( x - 10) to x-10/3.

2) Multiply both sides by 3.

Simplify 4 × 3 to 12.

4) Add 10 to both sides.

5) Simplify -12 + 10 to -2.

So, therefor, the answer is, x = -2.
F(4) = 2(4)^3 -5
= 2(64) -5
= 128-5
= 123
Hope this helps!
B. (x-4)(3x2-5)
your welcome
Answer: I think it is b
Explanation: