Question 146839
1.Let's call your number N.
The sum of a number and two is doubled: 2(N+2)
Six less than 3 times the number : 3N-6
The result is : =
Let's put it all together.
{{{2(N+2)=3N-6}}}
{{{2N+4=3N-6}}}
{{{N=10}}}
The answer is d)10.
Check your answer. 
The sum of a number and two is doubled: 2(10+2)=24
Six less than 3 times the number : 3(10)-6=24
Good answer.
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2.No formula was given for the second part. 
Please re-post.