Which of the following statements correctly describes the position of the intake and exhaust valves during most of the power stage in a four-cycle gas engine? a. both the intake valve and the exhaust valve are open. b. the intake valve is closed and the exhaust valve is open. c. the intake valve is open and the exhaust valve is closed. d. both the intake valve and the exhaust valve are closed.

Frank has $66.50 in his account on sunday. over the next week, he makes the following changes to his balance via deposits and purchases: day debit ($) credit ($) monday 60.33 80.75 tuesday 54.45 wednesday 49.20 15.00 thursday 35.40 friday 16.85 75.00 saturday 80.56 on what day does frank first get charged an overdraft fee? a. wednesday b. thursday c. friday d. saturday select the best answer from the choices provided a b c d

In trapezoid efgh, m∠hef=(4x2+16)∘ and m∠gfe=(5x2+12)∘. find the value of x so that efgh is isosceles.

With number 11 ( show how you got the answer)