you have to know what x and s are because they are variables.
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=7(x+s)
x-7
2(x+y) is twice the sum of x and y, and 2x+y is the sum of twice x and y
There is a formula to calculate this sum. It is, S = ½n(n + 1) In this question, n = 25 so the sum of the numbers from 1-25 is, ½ x 25 x 26 = 325
To find the sum of x and y, you simply add the two variables together: sum = x + y. If you have specific values for x and y, you can substitute them into this equation to calculate the sum. Otherwise, the sum remains expressed as x + y.