Page 426 - Algebra 1

20. Commerce The weekly profit, p, in dollars at Bill’s TV repair shop can be estimated by (52) the equation p = 30n - 400, where n is the number of TVs repaired in a week. Graph
the equation and predict the profit for a week if 50 TVs are repaired.
Evaluate.
21. Evaluate √4 x2 when x = 9. 22. Evaluate √3 x6 when x = 2.
(46) (46)
23. Write an equation for a direct variation that includes the point (10, -90). (56)
24. Multi-Step Levi deposits $500 into a savings account that earns interest
(53)
compounded annually. Let r be the annual interest rate. After two years, the balance from the first deposit is given by the polynomial 500 + 1000r + 500r2. A year after making the first deposit, Levi makes another deposit. A year later, the balance from the second deposit is 600 + 600r.
a. Find the balance of the accounts combined in terms of r after 2 years.
b. Find the balance after two years when r = 0.03. Find the missing number.
25.
(47)
27.
(57)
original price: $68
new price: ______ 29% increase
26. original price: ______ (47)
new price: $98.60 15% decrease
Triathlon Training Training for a triathlon involves running, swimming, and biking. The athlete runs every (2r - 2s) days, swims every (4r2 - 4rs) days, and bikes every (8rs - 8s2) days. When would the athlete have all three activities on the same day?
28. Multiple Choice Which of the following is not equivalent to √ 280 0?
(61)
*29.
(60)
A 10 √ 28 B 2 √ 70 0 C 20 √ 7 D 40 √7 Gardening Isaac is planting a square flower garden. He wants a 10-inch-wide
brick border around the outside edge of the garden. The total side length is 9x. Write a special product that represents the area of the garden not including the brick border. Simplify.
9x 10
inches
*30. Coordinate Geometry Lucia drew a square on grid paper that has an area of 25 units2. (61) What points could she have plotted?
Lesson 62 411