Is this one-one, onto , both or neither?

f:[-2,2] ---> R defined by f(x) = x^2​

Evaluate the function , when d = {9, 15, 30}. r = {5, 7, 12} r = {6, 10, 15} r = {6, 10, 20} r = {5, 12, 20}

Sole the equation 6n + 9 = -3n - 21 - 6 for n

Ashley spent half of her lunch money on a turkey sandwich. then she spent two-thirds of the money she had left on a bottle of juice and the rest of the money on a cookie. if the cookie cost $.75, how much lunch money did ashley have to start with?