What is the sum of open paren negative 2 point 1 x plus 3 point 7 close paren and open paren 5 plus 4 point 9 x close paren ?
Answer
A
7 point 0 x plus 8 point 7
B
negative 2 point 8 x plus 8 point 7
C
2 point 8 x plus 8 point 7
D
negative 7 point 0 x plus 8 point 7
Explanation
Remove the parentheses and combine like terms: the x-terms are −2.1x + 4.9x = 2.8x, and the constants are 3.7 + 5 = 8.7. The sum is 2.8x + 8.7, which is choice C.
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