Mt& a uses the function f(x)=475-15x-15x. to depreciate smart phones. where f represents the value of smart phone and x represents the number of months since its purchase.
a) find f^-1 and explain what it represents in this situacions
when will the deprecated value of smart phone be less than $100.00?
what does x represent in f^-1(x) =30? what is the value of x?
graph f(x) and f^-1 (x) on the same coordinate

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for

b. 2 and 4

step-by-step explanation: