in a class of 80 students in Debre Berhan university,45 good in mathematics,15 are good in both Mathematics and English,13 are good in both Mathematics and Psychology, 16 are good in both in English and psychology,20 are good in Psychology and 9 are good in both of the three courses A, how many students are good in mathematics only? B, how many students are not good in any of three courses?

Which inequality is equivalent to -3x < -12? x < 4 , x < -4 , x > 4, x > -4

Apackage of five erasers cost 0. $.39 at this rate how many how much would 60 erasers cost in dollars and cents

20 points 1. your friend, taylor, missed class today and needs some identifying solutions to systems. explain to taylor how to find the solution(s) of any system using its graph. 2. taylor graphs the system below on her graphing calculator and decides that f(x)=g(x) at x=0, x=1, and x=3. provide taylor some feedback that explains which part of her answer is incorrect and why it is incorrect. f(x)=2x+1 g(x)=2x^2+1