Page 225 - Algebra 1

24. Write Explain how to find the solution of 0.09n + 0.2 = 2.9. (24)
25. KeepingCool TheBritishthermalunit(BTU)isaunitofenergyusedgloballyin (21) air conditioning industries. The number of BTUs needed to cool a room depends
on the area of the room. To find the number of BTUs recommended for any size room, use the formula B = 377lw, where B is the number of BTUs, l is the length of the room, and w is the width of the room. The room you want to cool uses the recomended number of 12,252.5 BTUs and is 5 meters wide. Find the area of the room.
26. Multi-Step A quarterback throws the ball approximately 30 times per game. He (20) has already thrown the ball 125 times this season. The equation y = 30x + 125
predicts how many times he will have thrown the ball after x more games.
a. Copy and complete the table using a graphing calculator and then graph the solutions.
b. When will he have thrown the ball more than 300 times?
27. Marathons A marathon is 26.2 miles long. In order to qualify for the Boston
(21) Marathon, Jill must first complete a different marathon within 3_2 hours. Her 3
average speed in the last marathon she completed was 7.8 miles per hour. Did she qualify for the Boston Marathon? Explain.
x
y
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28. Geometry The rectangles shown are similar. (31)
6
x
46
a. Find the ratio of the side lengths of the smaller rectangle to the larger rectangle.
b. Find the longer side length of the larger rectangle using proportions.
29. Jack is building a square pen for his dog. If he wants the area of the pen to be
(13) 144 square feet, how long should he make each side of the pen? 30. True or False: Whole numbers include negative numbers.
(1)
210 Saxon Algebra 1