Section 1.5: Exponential Functions

.0001pt; text-indent: -31.5pt;”> 1. The radioactive isotope Bismuth-210 has a half-life of 5 days. How many days does it take for 87.5% of a given amount to decay?

a.

15

e.

11

b.

8

f.

9

c.

10

g.

12

d.

13

h.

14

2. A bacteria culture starts with 200 bacteria and triples in size every ten minutes. After 1 hour, how many bacteria are there?

a.

1800

e.

48,600

b.

3600

f.

145,800

c.

5400

g.

437,400

d.

16,200

h.

1,312,200

3. A bacteria culture starts with 500 bacteria and doubles every 2 hours. How many bacteria are there after 6 hours?

a.

1,000

e.

3,000

b.

1,500

f.

4,000

c.

2,000

g.

5,000

d.

2,500

h.

10,000

4. For what value of xis 3.png”>=.png”>?

a.

0

e.

2

b.

.png”>

f.

.png”>

c.

1

g.

3

d.

.png”>

h.

.png”>

5. Which of the following statements are true about the graph of the function y= 2.png”>.png”>8?

(i) It has no vertical asymptote.

(ii) It has no horizontal asymptote.

(iii) It has a y-intercept at –3.

(iv) It has an x-intercept at 3.

a.

(i) only

e.

(ii) and (iii) only

b.

(i), (iii), and (iv) only

f.

(i) and (iv) only

c.

(ii), (iii), and (iv) only

g.

(ii) and (iv) only

d.

(iv) only

h.

(i), (ii) and (iv) only

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