The volume of the box is modeled by the function V(x)= 5x² + 5x. What is the volume when x=4 OA 30 cubic units OB. 120 cubic units OC 45 cubic units OD. 100 cubic units

Can someone me my sister? she is in third grade. 50 points and brainlist! ones that are not answered. plz and thx!

Kevin is an insurance salesman. when he sells a policy, he makes 20 percent of the policy premium (p) up front; then each year the policy is active, he receives 15 percent of the original premium. which equation could be used to figure his total commission on a policy that has been active for five years? c=0.80p c=0.20p + 0.15p c=0.35p + 4(0.15) c=0.95p

Which of the following is the major negative aspect of crossover designs for research studies? a. prohibitive cost b. residual effects c-subject drepout d. incomplete randomization e. large sample size required