Answer: C) All real values of x such that 
In other words, x must be 0 or smaller.
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Explanation:
The reason why is because we must make the stuff under the square root to never be negative. We must make -2x be 0 or larger.
So,
As an example, if x = -2, then -2x = -2(-2) = 4 is positive. Applying the square root to a positive number is valid.
But if x = 5, then -2x = -2*5 = -10 is under the square root, which is not allowed.
Answer:
A
Step-by-step explanation:
Use the formula rise/run. The rise, in this case, was 3 and the run was 1. There for it would be 3/1 which is simplified to 3.
Answer:
6%
Step-by-step explanation:
19.20 = 320x (suppose x = tax rate)
Divide both sides by 320
x = .06 or 6%
Answer:
The answer is B
8×20=160 for the first job
20d for the second job
(85 + 80 + 75 + x) /4 = 87
(240 + x) /4 = 87
240 + x = 348
x = 108
She needs a 108 in order to have the test average of 87.
(85 + 80 + 75 + 108)/4 = 87
348/4 = 87
87 = 87
