7. John has B bats and buys C bats more. He then gives away D bats. Which of the following algebraic statements corretly shows how many bats John has left?a. D – BCb. B – C – Dc. B + C – Dd. B + D + C8. What is the representation algebraically of the cost of L feet of lumber at Y dollars per foot?a. L + Yb. LYc. L / Y