The first 5 terms of a sequence are shown below: 3, -2, -7, -12, -17

Which expression can be used to find the nth term?
A. a n = − 5 + 3 ( n − 1 )
B. a n = 8 − 5 n
C. a n = − 17 + 3 ( n − 1 )
D. a n = 3 + 5 n

3

step-by-step explanation:

in standard form:

a= dictionaries

b= maps

you have to buy 3 dictionaries, so put a 3 next to the a (dictionaries) so that you can multiply them by each other.

a3+b= 60 (the amount of money you have)

we already know the cost of a=15 so replace a with $15

($15 x 3)+b=60

multiply 15 and 3 to get $45 and replace it with $45

45+b=60

and then replace b with 15 to get the total:

45+15=60

that means you have $15 left after buying 3 dictionaries.

15 divided by the cost of a map ($5) equals 3.

so you can buy 3 maps.

sorry if it was confusing!

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