C. 75
70+35+x=180
70+35=105
180-105=75
Answer:
(4, 3)
Step-by-step explanation:
#1. Isolate x:
3x + y = 15
y = 15 - 3x
Substitute and solve for x:
5x - 3y = 11
5x - 3(15 - 3x) = 11
5x - 45 + 9x = 11
5x + 9x = 11 + 45
14x = 56
x = 4
Substitute and solve for y:
y = 15 - 3x
y = 15 - 3(4)
y = 15 - 12
y = 3
The value of k is -11
Further explanation:
Any number being a factor states that the value of expression will be equal to zero at the factor.
Given

and
x+2 is a factor
x+2 = 0
x=-2
If x=-2 is a factor of given expression then the expression will be zero at x=-2
So.

The value of k is -11
Keywords: Synthetic division, Factorization
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