If the sum of a number and 4 is (X + 4)
then twice that is 2(X + 4)
which is 2X + 8
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2*4 + 3*x = 34
Half of 18 is 9 and 5+4 = 9 so the number is 5
Twice the sum of 'x' and 'y' . . . 2(x+y) The sum of twice 'x' and 'y' . . . (2x+y)
Your equation would be 5(x + 4). In this case it's easiest to work backwards, starting with the "sum of a number and four" part of the problem. This is simply written as x + 4, since we don't know what "a number" is referring to and have to call it x. Then we just need to multiply that answer by 5, so we'd write the equation as 5 * (x + 4) or 5(x + 4). Make sure you have the parentheses, because if not it changes the answer entirely.
18. 1+8=9 9x2=18