There are 45 students in a school play. 3/5 of the students are preforming and the remainder of students are pert of the backstage crew.

Assuming the question is: How many students are performing:

There are 45 students. The number of students performing is 3/5 of this total number of students.

This number is actual figures is:

= 3/5 * 45

= 27 students

The number of students in the backstage crew is therefore:

= 45 - 27

= 18 students

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

answer:

f(5/2) = 10/3

i hope this you!