Application Practice
Practice
Practice 1
Write an expression for: "5 more than twice a number n"
Practice 2
Evaluate 3x + 7 when x = 4
Practice 3
Solve: x + 15 = 42
Practice 4
Solve: 4x = 36
Practice 5
Solve: x - 8 = 23
Practice 6
Write and solve: "A number divided by 6 equals 9"
Practice 7
Simplify: 4x + 3 + 2x - 1
Practice 8
Movie tickets cost $12 each. Write an expression for the cost of t tickets, then find the cost for 5 tickets.
Practice 9
Sarah has $45. She buys a book for b dollars and has $32 left. Write and solve an equation to find b.
Practice 10
The perimeter of a square is 48 cm. Write and solve an equation to find the side length s.
Answers
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1. 2n + 5
2. 3(4) + 7 = 12 + 7 = 19
3. x = 42 - 15 = 27
4. x = 36/4 = 9
5. x = 23 + 8 = 31
6. x/6 = 9, so x = 54
7. 6x + 2
8. Expression: 12t. Cost for 5: 12(5) = $60
9. 45 - b = 32, so b = $13
10. 4s = 48, so s = 12 cm