what is an exponent

ATI TEAS 7

TEAS Practice Test Math

1. What is an exponent?

A. A number that tells how many times to multiply
B. A number that is multiplied
C. A number that divides evenly into another number
D. A number that represents the square of a number

Correct answer: A

Rationale: An exponent is a number that indicates how many times a base number is multiplied by itself. The correct answer (A) accurately defines an exponent as a multiplier that shows how many times a number should be multiplied by itself. Choice B is incorrect as it describes a factor rather than an exponent. Choice C is incorrect as it defines a divisor, not an exponent. Choice D is incorrect as it specifically refers to the square of a number, which is not a general definition of an exponent.

2. Which of the following is an example of an unsaturated fatty acid?

A. Stearic acid
B. Palmitic acid
C. Oleic acid
D. Butyric acid

Correct answer: C

Rationale: Oleic acid is an example of an unsaturated fatty acid because it contains one or more double bonds in its hydrocarbon chain, leading to kinks in the chain structure. This unsaturation gives it a lower melting point compared to saturated fatty acids. Stearic acid (A), Palmitic acid (B), and Butyric acid (D) are examples of saturated fatty acids as they do not contain any double bonds in their hydrocarbon chains, leading to a straight structure and higher melting points.

3. What is the role of bile in digestion?

A. To break down carbohydrates
B. To emulsify fats
C. To neutralize stomach acid
D. To absorb proteins

Correct answer: B

Rationale: Bile emulsifies fats, breaking them down into smaller droplets for easier digestion.

4. Which of the following best describes a chemical change?

A. Melting ice to form water
B. Dissolving sugar in water
C. Burning wood to produce ash
D. Crushing a can to reduce its size

Correct answer: C

Rationale: A chemical change involves a chemical reaction where new substances are formed. Burning wood to produce ash is an example of a chemical change because the wood undergoes a chemical reaction to form a new substance (ash). In this process, the chemical composition of wood changes to produce ash, which is a new substance. On the other hand, melting ice to form water, dissolving sugar in water, and crushing a can to reduce its size are examples of physical changes. In these instances, the substances may change their physical state or appearance but do not undergo a chemical reaction to form new substances. Therefore, choice C is the correct answer as it represents a chemical change, while choices A, B, and D represent physical changes.

5. Jorgen is doing a project on the ancient Greek mathematician and poet Eratosthenes. In his initial review, Jorgen learns that Eratosthenes is considered the first person to calculate the circumference of the earth, and that he is considered the first to describe geography as it is studied today. To which section of the library should Jorgen go to find one of the early maps created by Eratosthenes?

A. 100
B. 300
C. 600
D. 900

Correct answer: D

Rationale: The 900 section contains works on history, geography, and biography, which is where Jorgen is likely to find early maps by Eratosthenes. Eratosthenes was not only a mathematician but also a geographer, so his maps would be classified under history and geography, making Section 900 the most appropriate choice. Sections 100, 300, and 600 do not specifically cater to history, geography, or biography where Eratosthenes' early maps would be located.