What are the like terms in the expression? 4 m minus 9 + 3 n + 2

(Answers are:)

–9 and 2
–9 and 3n
4m and 3n
4m and –9

Solve - pv + 40 < 65 for v solve 7w - 3r = 15 for r

Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items

X+ y = 5 ; x - y =3 solve using linear combination