The function f(x) = (x - 4)(x - 2) is shown.
1 answer:
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Answer:
Step-by-step explanation:
Given
Required
Determine the amount of sweet Ivy gets when Dennis = 42
We have:
and
Substitute 42 for Dennis in
Convert to fraction
Cross Multiply:
Divide through by 7
9514 1404 393
Answer:
78.71 mph
Step-by-step explanation:
You're looking for the solution to ...
d = 88
0.0015r^2 +r = 88
0.0015r^2 +r -88 = 0
Using the quadratic formula*, we find ...
r = (-1 +√(1² -4(0.0015)(-88)))/(2×0.0015)
r = (-1 +√1.528)/0.003 = 0.236123/0.003 = 78.7077
The speed of the car was about 78.71 mph.
_____
* The quadratic formula will also give a negative answer of about -745 mph, which is not relevant to the situation.
