SAT Mathematics Practice Test 6

Since the product of $\mathit{x}-6$ and $\mathit{x}+0.7$ equals 0, by the zero product property either $\mathit{x}-6=0$or $\mathit{x}+0.7=0$.Therefore, the solutions to the equation are 6 and −0.7. The sum of $6$ and $-0.7$ is $5.3$.Choice A is incorrect and is the result of subtracting $6$ from $-0.7$ instead of adding. Choice B is incorrect and may be the result of erroneously calculating the sum of $-6$ and $0.7$ instead of 6 and $-0.7$. Choice D is incorrect and is the sum of 6 and $0.7$, not 6 and $-0.7$.