You times 4 by everything inside the parentheses, so the answer would be as follows. 16a + 20b - 12
6.8
= 6 + 0.8
= 6 + 8/10 (simplifying...)
= 6 + (8 : 2)/(10 : 2)
= 6 + 4/5
= 6 4/5 <----- this is the answer.
I hope this helps. =)
B.
You can get this by using the quadratic equation, which I listed below.

With a = 2, b = 1, c = -45
Answer:
B, 3 8/9
Step-by-step explanation:
It all comes down to equivalent fractions.
2 1/3 as an improper fraction is 7/3.
1 5/9 as an improper fraction is 14/9. 1/3 = 3/9.
With that being said 7 x 3 = 21 resulting in 21/9.
14/9 + 21/9 = 35/9.
35/9 as a mixed fraction is 3 8/9.
135,634,554.....the 3 is in the 10 millions place
so the 3 is 30,000,000