Simplify (a^2b^3)^5 a^10b^15 a^7b^8 (ab)^30 a^10b^8
1 answer:
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This is known as a piecewise function. It's a function that depends on what t is valued at. There are three cases
If
then f(t) = 0. This means that for the first 30 minutes, the cost is $0, in other words the first half hour is free.
If
then f(t) = 5 indicating that the cost is $5 for the entire span from 30 minutes to 90 minutes (excluding t = 30 but including t = 90). Choice B is not the answer because the cost isn't $5 per minute. The cost for this entire timespan is simply $5
Finally, if t > 90, then f(t) = 10 telling us that any time value over 90 minutes will have the cost be $10. This is why the answer is choice D
If
If
Finally, if t > 90, then f(t) = 10 telling us that any time value over 90 minutes will have the cost be $10. This is why the answer is choice D