Question

Which expression can be used to model the phrase “the sum of three and a number”? 3+x x-3

Answer 1

a=3+b. That is a reasonable expression, because a= the sum of 3 and b, an unknown number.

Answer 2

3+x

Explanation:

“the sum of three and a number”

Frame an expression for the given statement

Expression contains variables and operators like add, subtract , multiply and divide

LEt the unknown number be x

Sum represents the addition of two numbers

Sum of three and a number means the addition of 3 and number x

So the expression become 3+ x