2 * (x + 7) 2x + 14 ■
666
10
The number is 17.
2x+7=n
2x + 7 = 30 - 7 - 7 2x = 23 x = 23/2 x = 11.5
11,33
x = 11
The difference between a number x and twice y is equal to fifteen.
The number is 7.
To write twice the sum of a number and 600, you first express the number as a variable, such as ( x ). The sum of the number and 600 can be written as ( x + 600 ). Therefore, twice this sum is represented as ( 2(x + 600) ).
If the number is n, then twice the number is 2n and the sum of the two is n + 2n = 3n.
The question cannot be answered because it is ambiguous. Does "twice the sum of 16 and a number" mean "2*16 + x" or does it mean "2*(16 + x)"