Which is the difference in cost when purchasing 5 pounds of fudge at each store

In what form is the following linear equation written y=9x+2

Proceed as in example 3 in section 6.1 to rewrite the given expression using a single power series whose general term involves xk. ∞ n(n − 1)cnxn − 2 n = 2 − 4 ∞ ncnxn n = 1 + ∞ cnxn n = 0

Hardest math question of all time can you solve the equation. check for extraneous solutions.9∣9-8x∣ = 2x+3