This type of problem can be decided by looking at whether the function is positive or negative in the vicinity of the zeros. There are three roots: -12, -6, and 2 at which the function is clearly 0. Look at the four intervals the x axis:
interval x<-12: function is negative (just test using a number <-12, say, -13)
interval (-12,-6): function is positive
interval (-6, 2): function is negative
interval x>2: positive
From the above you deduce that at the roots the function must be crossing the x-axis (as opposed to just touching it) because the function value changes its sign every time.
Answer: 13
Step-by-step explanation:
Answer:
Your answer is 0.3y + 2
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Answer:
2x - 18
$3,382
Step-by-step explanation:
x = number of dollars gained last month
this month:
twice the amount = 2x
minus $18 = 2x - 18
x = 1,700
2x - 18
2(1700) - 18
3,400 - 18
$3,382
