2. let f: a → b and g: b c be functions. prove or disprove each of the following: (a) if both f and g are one-to-one then go f is one-to-one. (b) if go f is one-to-one then f is one-to-one. (c) if go f is one-to-one then g is one-to-one. (d) if go f is one-to-one and f is onto then g is one-to-one.

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.

How long does it take natsumi to clean up after she is done? table: .area time30. 245. 2.7560. 3.5

Given the system of equations presented here: 2x + 4y = 14 4x + y = 20 which of the following actions creates an equivalent system such that, when combined with the other equation, one of the variables is eliminated? multiply the second equation by â’4 to get â’16x â’ 4y = â’80 multiply the second equation by â’1 to get â’4x â’ y = â’20 multiply the first equation by 2 to get 4x + 8y = 28 multiply the first equation by â’1 to get â’2x â’ 4y = â’14