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Training · Math 7 / 10 · 00:42
Math · Algebra · Linear functions

A car-sharing service charges $18 for the first hour and $7 for each additional hour. Which function C gives the total cost, in dollars, of renting a car for h hours, where h ≥ 1?

AC(h) = 18 + 7h
BC(h) = 25h
CC(h) = 18 + 7(h − 1)
DC(h) = 7 + 18(h − 1)
Analyzing your answer…
EdBot recommends

The $18 already covers the first hour, so only h − 1 hours are billed at $7. Check which option multiplies 7 by h − 1, not by h.

Solution available

Answer: C — C(h) = 18 + 7(h − 1). Every solution walks you through each step and why the other choices fail.

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Training · Reading and Writing SAT · 3 / 10
Information and Ideas · Central Ideas and Details

Utah is home to Pando, a colony of about 47,000 quaking aspen trees that all share a single root system. Pando is one of the largest single organisms by mass on Earth, but ecologists are worried that its growth is declining in part because of grazing by animals. The ecologists say that strong fences could prevent deer from eating young trees and help Pando start thriving again.

According to the text, why are ecologists worried about Pando?

AIt isn't growing at the same rate it used to.
BIt isn't producing young trees anymore.
CIt can't grow into new areas because it is blocked by fences.
DIts root system can't support many more new trees.
Analyzing your answer…
EdBot recommends

The text says growth "is declining" — slowing, not stopped. Reread the second sentence and watch for choices that overstate what it claims.

Solution available

Answer: A. The text says Pando's growth is declining — it isn't growing at the rate it used to. B overstates it ("anymore"), C reverses the role of the fences, and D is never stated.

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Training · Math Session 7
your accuracy today
Linear functions 40%
Percentages 60%
Circles 92%
Weighing your accuracy against each skill's share of the test…
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Linear functions low · key skill ×3
Percentages needs work ×2
Circles review only ×1
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