What is the chemical formula for copper(ll) sulfate? A) CuSO4
B) Cu2SO4
C) CuS
D) Cu2S
[help pls]

If there is no real number solution to the quadratic equation x^2+2x+c=0 what is a possible value of c? 1 -2 0 3

Astore sells two types of radios. one type sells $87 and the other for $119. if 25 were sold and the sales were $2495, how many of the $87 radios were sold a) 5 b) 20 c) 15 d)10

Which of the following best describes the delian problem?