D&E UB Math Pre-Test 2023

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Please complete each question by selecting the correct multiple choice answer.

First Name *

Last Name *

Grade *

Rising Junior

Rising Senior

1. Type the exact answer in the space below. *

1 point

2. Select the best answer to the question below.

1 point

1.55 billion

2.01 billion

19.27 billion

600,000,021

Clear selection

3. Select the equation that represents the given graph. *

1 point

4. Select the best answer to the question below. *

1 point

$3,003.00

$4,045.05

$4,031.75

$3,090.12

5. Select the best answer to the question below. *

1 point

$1,005.17

$2,028.06

$10,000.00

$1,105.17

6. Select the best answer to the question below. *

1 point

59.51 mg

168.03 mg

117.3 mg

82.7 mg

7. Select the best answer to the question below.

The half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 7.2 minutes has elapsed?

1 point

0.68 g

12.5 g

18.95 g

50 g

Clear selection

8. Select the best answer to the question below.

A lab has created a zombie virus. An accident caused 2 technicians to become infected. If each technician infects 3 more people every hour, how many zombies will there be after 12 hours?

1 point

8,192 zombies

8,000,000,000 zombies

33,554,432 zombies

536, 870, 912 zombies

9. One of the most common applications of an exponential decay model is carbon dating. Carbon-14 decays (emits a radioactive particle) at a regular and consistent exponential rate. Therefore, if we know how much carbon was originally present in an object and how much carbon remains, we can determine the age of the object. The half-life of carbon-14 is approximately 5730 years—meaning, after that many years, half the material has converted from the original carbon-14 to the new nonradioactive nitrogen-14. If an artifact that originally contained 100 g of carbon now contains 10 g of carbon, how old is it?

Select the best answer below.

1 point

19,034.65 years old

573 years old

5,730 years old

11,460 years old

10. Solve for x. Select the best answer below. *

1 point

64.5

7.01

258

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