IM Alg1.5.14 Practice: Recalling Percent Change
For each situation, write an expression answering the question. The expression should only use multiplication.
A person's salary is $2,500 per month. She receives a 10% raise. What is her new salary, in dollars per month?
A test had 40 questions. A student answered 85% of the questions correctly. How many questions did the student answer correctly?
A telephone cost $250. The sales tax is 7.5%. What was the cost of the telephone including sales tax?
In June, a family used 3,500 gallons of water. In July, they used 15% more water.
Select all the expressions that represent the number of gallons of water the family used in July.
Han’s summer job paid him $4,500 last summer. This summer, he will get a 25% pay increase from the company.
Write two different expressions that could be used to find his new salary, in dollars.
Military veterans receive a 25% discount on movie tickets that normally cost $16. Explain why represents the cost of a ticket using the discount.
A new car costs $15,000 and the sales tax is 8%. Explain why represents the cost of the car including tax.
The number of grams of a chemical in a pond is a function of the number of days, d, since the chemical was first introduced.
The function, , is defined by . What is the average rate of change between day 0 and day 7?
Is the average rate of change a good measure for how the amount of the chemical in the pond has changed over the week? Explain your reasoning.
A piece of paper is 0.004 inches thick.
Explain why the thickness in inches, , is a function of the number of times the paper is folded, .
Using function notation, represent the relationship between and . That is, find a function so that .
The function represents the amount of a medicine, in mg, in a person's body hours after taking the medicine. Here is a graph of .
How many mg of the medicine did the person take?
Write an equation that defines .
After 7 hours, how many mg of medicine remain in the person's body?