Page 443 - Algebra 1

3 4 *12. Measurement Giao wants to construct a picture frame made of wooden pieces that (63) are 7 centimeters and 3 centimeters in length. He needs 20 pieces, and the total
perimeter of the frame needs to be 108 centimeters. If Giao cuts eight 3-centimeter pieces first and is left with 0.8 meter of wood, will he have enough wood to cut
the 7-centimeter pieces? Explain.
Solve each system of linear equations by the method indicated.
13.
(55)
16.
(55)
*17.
(62)
Use graphing. 2x - y = 3 3x + y = 2
14. Use elimination.
15. Use substitution.
(63)
5x + 7y = 41 3x + 7y = 47
(59)
5x -2y = 22 9x + y = 12
18.
(49)
Banking Ryan and Kathy both have savings accounts. Ryan has $12 in his account and plans to add $3 each week to it. Kathy does not have any money in her account, but plans to add $5 each week. How many weeks will it take until Ryan and Kathy have the same amount of money?
Multi-Step The results for the women’s 3-meter diving finals at the NCAA Division II Championship in 2007 are listed below.
499.15, 429.15, 409.75, 405.90, 395.65, 382.15, 353.20, 351.75,
342.30, 333.75, 328.20, 325.75, 315.20, 302.85, 292.90, 277.90
a. Write Explain how to determine the intervals to create a histogram for the data.
Identify the intervals.
b. Create a histogram for this data using the intervals from part a.
c. Is a histogram or a stem-and-leaf plot a better display for this data? Explain.
Write the equation of the graphed line in slope-intercept form.
y
4
O
x
-8
-4
8
-4
-8
19.
(60)
20.
(60)
Investing Trey is making an investment of (x - 11) dollars. The rate of interest on the investment is (x - 11) percent. What is the interest gained after one year? (Hint: interest = principle × rate × time; i = prt)
Construction The school is constructing a new gym. They want a 12-foot-wide tile border around the outside edge of the square court, and the total side length is 7x. Write a polynomial for the area of the court, not including the tile border.
7x
428
Saxon Algebra 1
12 feet