Mrs. Sanchez Is taking an online test. At the bottom of the screen there is a progress bar. she has just finished 15 and on tje bar it tells her she is 25% done. How many total questions are on the test?

A.30
B.60
C.90
D.25

Don't know how to find x given these segment lengths

Inez has a phone card. the graph shows the number of minutes that remain on her phone card a certain number of days.

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .