What is the postive solutionto the equation 0=1/3x²-3​

1) you deposit $2,500 in an account that earns 4% simple interest. how much do you earn in eight years?

Which function has an inverse function? a.f(x)= |x+3|/5 b. f(x)= x^5-3 c. f(x)= x^4/7+27 d. f(x)= 1/x²

Is the response to the survey question "did you smoke in the last week question mark "response to the survey question "did you smoke in the last week? " a discrete random variable, a continuous random variable, or not a random variable?