The table shows the cost of books at our school library book sale. Do the data in the table show a constant of proportionality. If so, what is the constant of proportionality, k= y/x? A: 2
B: 2.5
C: 2/5
D: there is no constant of proportionality.

How many kilometers are equal to 5 miles? use 1 mile ≈ 1.61 kilometers. !

Jose predicted that he would sell 48 umbrellas. he actually sold 72 umbrellas. what are the values of a and b in the table below? round to the nearest tenth if necessary

Does the function satisfy the hypotheses of the mean value theorem on the given interval? f(x) = 4x^2 + 3x + 4, [−1, 1] no, f is continuous on [−1, 1] but not differentiable on (−1, 1). no, f is not continuous on [−1, 1]. yes, f is continuous on [−1, 1] and differentiable on (−1, 1) since polynomials are continuous and differentiable on . there is not enough information to verify if this function satisfies the mean value theorem. yes, it does not matter if f is continuous or differentiable; every function satisfies the mean value theorem.