Maryna spent 1/5 of her money on a book. If she had $80.00 left after she bought the book, how much money did she have originally?

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

Antonia and carla have an equivalant percentage of green marbles in their bags of marbles. antonia has 4 green marbles and 16 total matbles. if carla has 10 green marbles , how many total marbles does carla have

Find the number of real number solutions for the equation. x2 + 5x + 7 = 0 0 cannot be determined 1 2