Intermediate Algebra (11th edition)

7.Concept Check A student gave the following incorrect “solution.” WHAT WENT

WRONG?

Square root property

Solution set:

8.The Singapore Flyer, the world’s largest Ferris

wheel as of 2008, has a height of 165 m. Use

the metric version of Galileo’s formula,

(where dis in meters),

to find how long it would take a wallet dropped

from the top of the Singapore Flyer to reach the

ground. Round your answer to the nearest tenth of

a second. (Source:www.singaporeflyer.com)

9.2 Solve each equation by using the quadratic formula.

9. 10. 11.

12. 13. 14.

Use the discriminant to predict whether the solutions to each equation are

A.two rational numbers B.one rational number

C.two irrational numbers D. two nonreal complex numbers.

9.3 Solve each equation. Check your solutions.

19. 20.

21. 22.

23. 24.

Solve each problem. Round answers to the nearest tenth, as necessary.

25.Bahaa Mourad paddled a canoe 20 mi upstream, then paddled back. If the rate of the cur-
rent was 3 mph and the total trip took 7 hr, what was Bahaa’s rate?

26.Carol-Ann Vassell drove 8 mi to pick up a friend, and then drove 11 mi to a mall at a rate
15 mph faster. If Carol-Ann’s total travel time was 24 min, what was her rate on the trip to
pick up her friend?

27.An old machine processes a batch of checks in 1 hr more time than a new one. How long
would it take the old machine to process a batch of checks that the two machines together
process in 2 hr?

28.Zoran Pantic can process a stack of invoices 1 hr faster than Claude Sassine can. Working
together, they take 1.5 hr. How long would it take each person working alone?

9.4 Solve each formula for the indicated variable. (Give answers with. )

29. for v 30.p= for y 31.mt^2 = 3 mt+ 6 for t
    B

yz

6

k=

rF

wv^2



2 x2/3-x1/3- 28 = 0 p^4 - 10 p^2 + 9 = 0

• 2 r= 813 x+ 522 + 213 x+ 52 - 1 = 0
  B

48 - 20 r

2

1

n

+

2

n+ 1

= 2

15

x

= 2 x- 1

4 x^2 = 6 x- 8 9 z^2 + 30 z+ 25 = 0

x^2 + 5 x+ 2 = 0 4 t^2 = 3 - 4 t

2 x^2 + 3 x+ 4 = 0 3 p^2 = 212 p- 12 x 12 x- 72 = 3 x^2 + 3

2 x^2 +x- 21 = 0 x^2 + 5 x= 7 1 t+ 321 t- 42 =- 2

d=4.9t^2

E^223 F

x= 223

x= 212

x^2 = 12

*This exercise requires knowledge of complex numbers.

CHAPTER 9 Review Exercises 563