Question

A(n)=A(1)+(n-1)d
1)YOU HAVE A GIFT CARD FOR A COFFE SHOP WORTH $90.EACH DAY YOU USE THE CARD TO GET COFFEE FOR $4.10.WRITE A RULE TI REPRESENT THE AMMT.OF MONEY LEDT ON THE CARD AS AN ARITHMETIC SEQUENCE .WHAT IS THE VALUE OF THE CARD AFTER BUYING 8 COFFEES

Answer 1

So if you have $90 and it is the first day you use your card, you have wait left 90-4.10.
Second day you have 90-4.10-4.10=90-2(4.10)
Third day you have 90-4.10-4.10-4.10=90-3(4.10)
...
so on the nth day what do you have on your card?

Answer 2

what is the pattern?

Answer 3

-4.10 each day

Answer 4

1st day we have 90-1(4.10)
2nd day we have 90-2(4.10)
3rd day we have 90-3(4.10)
4th day we have 90-4(4.10)
...
nth day we have ?

Answer 5

90-9(4.10)

Answer 6

So this would be the rule right?

Answer 7

90-n(4.10) is what we have on the nth day

Answer 8

$53.10

Answer 9

now if you want to figure out what you have left on that gift card on the 8 th day you just plug in your little 8 in the rule i gave you

Answer 10

so the rule in 90-n(4.10)

Answer 11

yes you gave me the 9 th day
that is the nth day i was asking for

Answer 12

oh thank u so much
can u help me with the other one please