Is a -2/3 a integer?Is it also a rational number?

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)

Mr.zimmerman invested $25,000 in an account that draws 1.4 interest, compouneded annually. what is the total value of the account after 15 years

X/y + 4y/x divided by x/y - 2y/x explain as in depth as you can how you simplfied the fractions. i don't know where to start on this : /