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Algebra_3

Chapter 60

Problem 1

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John paid dollars for groceries this week.
This was percent more than he paid for groceries last week.
How many dollars D did John pay for groceries last week?
A diagram might be helpful to solve the problem.
This statement can be written in shorthand form as:

click refresh (F5)

D = dollars


Example:

Suppose you have a box of N marbles. (see figure below)



20 percent of the number N is 80 marbles.

Solution: 20 percent is written as click refresh (F5)

and thus 20 percent of N is 80 is written as click refresh (F5)
Solving for the number N gives: click refresh (F5) Try this solution by entering (100/20)80 into the Graphing Calculator in the Function f(x) = box .
Click on the Plot Graph button.
The answer will appear below the Function f(x)=box as f(x) = 400