Ruth has the following set of refrigerator magnets: {a, b, c, d, e}. (a) how many different three-letter strings can she form with these magnets? (b) how many different three-letter strings can she form if the middle letter must be a vowel?

X2 + y 2 = 36 x + y = 6 solve the system of equations.

What is x3+3x2−16x−48 divided by x−1?

Sample response: if the graph passes the horizontaline test, then the function is one to one. functions that are one to one have inverses that a therefore, the inverse is a hinction compare your response to the sample response above. what did you include in your explanation? a reference to the horizontal-line test d a statement that the function is one-to-one the conclusion that the inverse is a function done