One hundred students were surveyed about whether they prefer snapchat or instagram. out of the 50 boys surveyed there were 40 boys who prefered instagram. out of the 50 there were 30 girls who prefered snapchat.
assuming that all students have a preference how many girls prefered instagram?

In a survey of 1015 adults, a polling agency asked, "when you retire, do you think you will have enough money to live comfortably or not. of the 1015 surveyed, 534 stated that they were worried about having enough money to live comfortably in retirement. construct a 90% confidence interval for the proportion of adults who are worried about having enough money to live comfortably in retirement.

Solve the equation for b: a= (1/2)(b)(h)

32a³b² 8ab² simplify the following expression.