A carnival charges $7 to enter the carnival and $3 per ride. How many rides can you go on if you have a $50 bill?
2 answers:
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ANSWER
Multiply through by LCM of 15
Expand brackets to obtain,
Group like terms
In interval form it is written as
We are given our function as
For finding concavity , firstly we will find second derivative
now, we can find derivative again
now, we can know second derivative is undefined when denominator =0
so, we set denominator =0
and then we can solve for x
now, we can draw a number line and locate x=-4
and then we can find sign of second derivative on each intervals
so,
Concave downward interval:
