Name the coefficients, any like terms, and any constants.
coefficients
like terms
constants
3x + 7

Coefficient- 3
Like terms- none
Constant- 7

The coefficient is the number next to the variable. The only number here attached to a variable is 3, so that is the coefficient.

Like terms are when two numbers share the same variable, or lack of. For example, if your equation was 3x+7+9, the like terms would like 7 and 9. But if your equation was 3x+7+9x, the like terms would be 3x and 9x. Since we see none of these, there are no like terms.

Constants are the opposite of coefficients. These are numbers without a variable attached to it. In this case it is 7.

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Yes i could be the length of the triangle