Chapter 9 - XYZ Custom Plus

9.6 Problem Set
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Problem Set 9.6
A The formula for the area A of a rectangle with length l and width w is A 5 l ? w. Find A if: [Examples 1–4]
1. l 5 32 feet and w 5 22 feet
2. l 5 22 feet and w 5 12 feet
3. l 5 3 } 2
inch and w 5 3 } 4
inch
4. l 5 3 } 5
inch and w 5 3 } 10
inch
The formula G 5 H ? R tells us how much gross pay G a person receives for working H hours at an hourly rate of pay R. In
Problems 5-8, find G.
5. H 5 40 hours and R 5 $6
6. H 5 36 hours and R 5 $8
7. H 5 30 hours and R 5 $9} 1 8. H 5 20 hours and R 5 $6} 3 2 4
Because there are 3 feet in every yard, the formula F 5 3 ? Y will convert Y yards into F feet. In Problems 9-12, find F.
9. Y 5 4 yards
10. Y 5 8 yards
11. Y 5 2 2 } 3
yards
12. Y 5 6 1 } 3
yards
If you invest P dollars (P is for principal ) at simple interest rate R for T years, the amount of interest you will earn is given
by the formula I 5 P ? R ? T. In Problems 13 and 14, find I.
13. P 5 $1,000, R 5
7
6
}, and T 5 2 years 14. P 5 $2,000, R 5 }, and T 5 2 } 1 years
100 100 2
In Problems 15-18, use the formula P 5 2w 1 2l to find P.
15. w 5 10 inches and l 5 19 inches
16. w 5 12 inches and l 5 22 inches
17. w 5 3 } 4
foot and l 5 7 } 8
foot
18. w 5 1 } 2
foot and l 5 3 } 2
feet