Which of the following equations has only one solution?

a. x^2 + 4x + 4 = 0
b. x^2 + x = 0
c. x^2 - 1 = 0

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

Amanda went into the grocery business starting with five stores. after one year, she opened two more stores. after two years, she opened two more stores than the previous year. if amanda expands her grocery business following the same pattern, which of the following graphs represents the number of stores she will own over time?

Can someone me with this graph problem by the way i need to know the answers by today since this assignment is due ! !