A medical researcher measures the increase in heart rate of patients under a stress test. What kind of variable is the researcher studying?

The options in this question are not given; here is the complete question:

A medical researcher measures the increase in heart rate of patients under a stress test. What kind of variable is the researcher studying?

A. Identifier

B. Categorical

C. Quantitative

D. Qualitative

The answer to this question is C. Quantitative

Explanation:

In research, a quantitative variable refers to a variable or factor that involves using numbers, percentages, and in general, quantities to be understood. Moreover, this is the opposite of qualitative variables that involve using qualities. The medical research described includes a quantitative variable because heart rate can only be measured and understood through numbers. Also, other types of variables such as qualitative or categorical are not involved because these are related to qualities rather than numbers.

b: |12 – x| ≤ 0.25

step-by-step explanation:      

let x be the possible lengths in inches, of the ribbons jaime cut.

we have been given that jaime is cutting strips of ribbon for a project. he tries to cut each piece to be 12 inches long, but sometimes he cuts it too long or too short by as much as 0.25 inch.  

we can represent this information in an inequality as:

by the definition of absolute value function we will get,

upon combining our inequalities we will get,

therefore, the inequality   describes all the possible lengths (x), in inches, of the ribbons jaime cut.

step-by-step explanation:

x = -5

step-by-step explanation: