We are given
x as the number of video games sold
the function for the revenue
and the function or the cost
We are asked fro the profit function.
Profit has the general formula
Profit = Revenue - Cost
Substituting
P(x) = R(x) - C(x)
P(x) = 60x - (12 + 7x)
P(x) = 60x - 12 - 7x
P(x) = 53x - 12
so ask your teacher, they always have the answer
Here is your answer I hope it’s helpful
The probability is 4⋅3⋅2⋅1/10•9•8•7=(4/4)(6/0)/(10/4)=1/210 so the probability of selecting 3 red balls would be 1/210
25% of the total students = 28
0.25x = 28....where x is the total students
x = 28 / 0.25
x = 112 <== total students in 8th grade