<span>0.3278
Use combination formula ((20C4)*(15C3))/(35C7) = 0.3278
20C4 - combinations of 4 females from 20
15C3 - combinations of 3 males from 15
35C7 - all possible combinations of 7 students from 35 students in total</span>
F(-1) = 3
..............................
Isolate the x. Note the equal sign. What you do to one side, you do to the other.
Subtract 8 from both sides
x + 8 (-8) = -2 (-8)
x = -2 - 8
Combine
x = -10
-10 is your answer for x
hope this helps
6 repeating so the answer would be 31.666666..... or round it up 31.666666667