Question

PLEASE HELP I ONLY HAVE 10 MINS!!

Ashley has 500 songs in his music player. Every week he adds 10 songs to his collection. How many songs will he have in his music player after 20 weeks?

At the end of n weeks, the number of songs is given by the function
A) f(n) = 500 + 10n
B) f(n) = 10 + 20n

f(n) = 500 + 10n f(n) = 10 + 20n . The output of the function is 700 600 when the input is 20.
A) 700
B)600

Answer 1

The answer to both equations is 'A'. For the first you just input the value of 20 to replace n and get 700. (Side-note: the number 20, which is your variable, should be nowhere in the function so you know b is wrong). so now that you have your answer 700 the second part is self explanatory.