Step-by-step explanation:
There are 2 questions in one.
1)
<u>Roberta is 20 years older than Julian. In 4 years, Roberta's age will be twice Julian's age:</u>
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2)
<u>Roberta is twice as old as David. In 10 years, Roberta will be 8 less than three times David's present age:</u>
Correct choice is A
The answer to -6(x+3)=6 is x= -4
64=16u
Divide both sides by 16
u=4
B = 12 - a
Subtract a from both sides to isolate b, and you get the answer.
