Answer:
D. a + 2b
Step-by-step explanation:
2(a + 2b) - a - 2b
Expand brackets.
2a + 4b - a - 2b
Combine like terms.
2a - a + 4b - 2b
a + 2b
a +2b
Distribute
2a +4b -a -2b
Combine like terms
2a -a + 4b-2b
58
28571/1000
r/5 4/7
Cross Multiply to get
r7 and 20
divide both sides by 7
r = 2.8571
Since that is in the thousands place the answer is 28571/1000