Evaluate each expression. 1. ry, for x = 3 and y = 5
VS
3-5
3. Sa + b, for a = 6 and b = 3
5. 9 - k, ror k = 2 7
9-2
7. 2 + n, for n = 3
Practice
6.3
2. 24 - P: 5. for p = 4.20
183
4. 6x, for x = 3
18
6731
6. 63 – p, for p = 7
9
6377
8. 3m, for m = 11
3 X 11
33
91243
10- 7+ 5, for r = 9
15 - 9
10. m + n 6, for m = 12 and n = 18
IR -18
11. 1,221 X, for x = 37
1,221:37
13. 4m + 3, for m = 5 8
12. 10 - x, for x = 3
7.
TO- 3
14. 35 – 3x, for x = 10
lo
5 h 30
15. 851 - p, for p = 215
16. 18a - 9b, for a = 12 and b = 15
17. 3ab - c, for a = 4, b = 2, and c = 5
18. ab + 4c, for a = 6, b = 5, and c = 3
19. ', for r = 9,5 = 2, and t = 4
20. x(y + 5) – z, for x = 3, y = 2, and z = 7
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21. Elliot is 58 years old.
a. Write an expression for the number of years by which Elliot's age
exceeds that of his daughter, who is y years old.
b. If his daughter is 25, how much older is Elliot?
22. A tree grows 5 in. each year.
a. Write an expression for the tree's height after x years.
b. When the tree is 36 years old, how tall will it be?
Pre-Algebra Chapter 1