Review for Test s1

Review for Test

Name: ______Date: ______Pre-Algebra CW/HW #96

1. The exact density of copper is 8.94 g/m3. Ben guessed the density of copper to be 9 g/m3.

What is the absolute error?

What is the percent error?

2. Mr. Rodriguez invests $2000 in a savings plan. The savings account pays an annual interest rate of % on the amount he put in at the end of each year.

How much will Mr. Rodriguez earn if he leaves his money in the savings plan for 10 years?

How much will be in his savings plan at the end of 10 years?

After how many years will Mr. Rodriguez have increased his original investment by more than 50%?

3. What is the percent of the following 36 points whose product of x-coordinate and y-coordinate is less than or equal to 9.

4. 49.5 is what percent of 33?

80 is 120% of what?

What is 35 decreased by 18%? 5. Use the following table to answer the questions below. Review for Test

Gallons (g) Miles Driven (m) 8 224 10 280 4 112

Is the relationship between gallons of gas used and miles driven proportional?

Write an equation, in terms of m, representing the relationship between the number of gallons of gas purchased and the miles driven.

What is the constant of proportionality?

Graph the relationship below.

6. Complete the table below Fraction Decimal Percent

0.02 Review for Test

7. Over the break, your uncle and aunt ask you to help them cement the foundation of their newly purchased land and give you a top-view blueprint of the area and proposed layout. A small legend on the corner states that 4 inches of the length corresponds to an actual length of 52 feet.

a. What is the scale?

b. What is the scale factor?

c. If the dimensions of the foundation on the blueprint are 11 inches by 13 inches, what are the actual dimensions?

d. What is the actual area of the foundation?

e. Your uncle is able to work faster than you! He uses 3 bags for every 2 bags you use. Is the relationship proportional? Explain your reasoning using a graph on a coordinate plane.

f. What does (0, 0) represent in terms of the situation being described by the graph created in part (e)?

g. What does (1, r) represent in terms of the situation being described by the graph created in part (e)?