Answer:
C. Subtraction property of equality
Step-by-step explanation:
Answer:
(-7, -10)
Step-by-step explanation:
Substitute x for -7.
Multiply 4 by -7.
Add 28 on both sides.
Divide -4 on both sides.
Answer:
9.9
Step-by-step explanation:
x² - 4x - 12 = 0
Factor the left side: (x + 2) · (x - 6) = 0
The equation is true if either factor is zero.
If (x + 2) = 0 then x = -2 .
If (x - 6) = 0 then x = 6 .
If the test gives a positive result for an infected person 98% of the time, that means that 2% of the time, it gives a negative result for an infected person, which would be a false negative.
If the test is 97% accurate for non-infected people, that means that it gives a negative result 97% of the time. So a positive result will be given 3% of the time for non-infected people, which is a false positive.
