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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 – BC
b. B – C – D
c. B + C – D
d. B + D + C
8. What is the representation algebraically of the cost of L feet of lumber at Y dollars per foot?
a. L + Y
b. LY
c. L / Y