There are 40 students in a class and 30% of these students passed their history test. What number of these students passed the test?
What part of the percent proportion are you missing?

What is the value of 1/3× + 7x, when x =5

Celeste wants to have her hair cut and permed and also go to lunch. she knows she will need $50. the perm cost twice as much as her haircut and she needs $5 for lunch. how much does the perm cost?

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)