Answer:
if x = 4, which of the following expressions does not equal 9
Multiple Choice:
A. x-(-5)
B. x+5
C. 2x + 1
D. x-13
Correct answer: D
Explanation:
First we have to substitute 4 into X for all the multiple choices ( A to D)
A. x-(-5): first substitute 4 for X we will get:
4 - (-5) remember order of operation. this means that we have to work with the parentheses first: negative times negative equal to positive. so, negative times negative 5 equal to positive five: - (-5) = +5 now we go back to solve the rest of the equaltion
4+5 = 9 which means that answer A is incorrect since the question is asking which expression does NOT equal to 9
B. x+5
4+5 = 9 the answer B is also incorrect because it's equal to 9
C. 2x+1
2(4) +1: 2 times 4 equal 8 plus 1 equal 9.
D. x-13
4 -13 = -9