F(x)=70n-400 how many students must be enrolled in the class for the instructor to make a profit?

6 students must be enrolled.

Step-by-step explanation:

F(x) must be greater than 0. Thus, 70*n-400 must be greater than 0.

70*n -400 >0

70*n > 400

n > 400/7

n > 5.7

n >6

about 0.75 hours

step-by-step explanation:

the domain of a function is the set of input values, x , for which a function is defined. the domain is shown in the left oval in the picture below. the function provides an output value, f(x) , for each member of the domain.