Assume that 28 take mathematics, 28 take psychology, and 13 take mathematics and psychology. how many students take exactly one of these two courses

Hi, can anyone show me how to do this problem? 100 points for this. in advance

Which function can be used to model the monthly profit for x trinkets produced? f(x) = –4(x – 50)(x – 250) f(x) = (x – 50)(x – 250) f(x) = 28(x + 50)(x + 250) f(x) = (x + 50)(x + 250)

What is the ratio fraction form of 25: 9