A manufacturer can sell all units of products at $30 each. The cost C(in dollars) of producing x
units each week is given by ()=3000+25−0.12
C
(
x
)
=
3000
+
25
x
−
0.1
x
2
. How many units should be produced and sold each week to obtain a profit?

Acollege is selling tickets for a winter fund-raiser. one day, krissa sold 14 adult tickets and 8 student tickets for a total of $376. the next day, she sold 7 adult tickets and 11 student tickets for a total of $272. krissa wanted to find the price of one adult ticket, a, and the price of one student ticket, s. she wrote and solved the following system of equations.