Professor jordan has suggested to his students that a strong relationship exists between the number of hours they spend studying and their grade on the final exam. he would like his students to improve their test scores by increasing the time they spend studying. the professor is describing a.
a. mean score.
b. negative correlation.
c. positive correlation.
d. standard deviation.

C. Positive correlation since he is telling the students of what they should do. It's not like if he is saying 'Study now! You students are dumb and get bad scores.' Mean scores are averages. Averages can be affected and could be the choice, but he says students, not class. So, C or A could fit.

walter needs to make at least 5 more cookies but no more than 40. 5 ≤ x ≤ 40

step-by-step explanation:

20 ≤ x + 15 ≤ 55

subtract 15 from all parts

20-15 ≤ x + 15-15 ≤ 55-15

5 ≤ x ≤ 40

this means how many more cookies he has to make

walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 ≤ x ≤ 40

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