Kenya said, "i solved david’s equation in a much quicker way! " she solved the

equation 4(x + 3) = 20 with an approach that she calls "looking inside." here is

how she described her thinking: "i think about everything inside the parentheses as a

group. after all, the parentheses group all that stuff together. i think the contents of

the parentheses must be 5."

a. why must the expression inside the parentheses equal 5?

b. write an equation that states that the contents of the parentheses must equal 5.

then solve this equation. did you get the same result as with david’s method?

Alarge university wanted to study the relationship between completing an internship during college and students' future earning potential. prom the same graduating class, they selected a random sample of 80 students who completed an internship and 100 students who did not complete an internship and examined their salaries five years after graduation. they found that there was a statistically higher mean salary for the internship group than for the noninternship group. which of the following interpretations is the most appropriate? a. there could be a confounding variable, such as student major, that explains the difference in mean salary between the internship and no internship groups.b. we cannot infer anything from these data since the distribution of salaries is likely right skewed.c. you cannot draw any valid conclusions because the sample sizes are different.d. more students should complete internships because having an internship produces a higher salary.