Simplify the expression. 7(a + 3b) + 2(a - b)

A.18a + 18b

B.9a + 23b

C.9(2a + 2b)

D.9a + 19b

D.9a+19b

Step-by-step explanation:

7(a+3b)+2(a-b)

7*a=7a

7*3b=21b

2*a=2a

2*-b=-2b

7a+21b+2a-2b

7a+2a=9a

21b-2b=19b

Hope this helps:)

Well, £13.50 in U.S dollars is (this is just how I'm figuring it out you can use whatever money system you need to to get the answer) $17.52 if you cut it in half because it says it is 50% off will be your answer the answer is $8.76 or £6.75 you also could have just dived £13.50 by 2