Which expression is equivalent to 7 (p+2n) + n?

We actually need the choices but oh well, we can simpify and hopefuly it is one of the choices

remember the distributive property

a (b+c) = ab+ac

so

7 (p+2n) + n

distribute first

7 (p) + 7 (2n) + n

7p+14n+n

7p+15n is an equivilent expression

The answer would be 7p+15n