Question

Determine whether the problems should be solved using the formula for an arithmetic sequence, arithmetic series, geometric sequence, or geometric series. Explain your answer.do not need to solve.

Answer 1

1. Jackie deposited $5 into a checking account in February. For each month following, the deposit amount was doubled. How much money was deposited in the checking account in the month of August?
2. A local grocery store stacks the soup cans in such a way that each row has 2 fewer cans than the row below it. If there are 32 cans on the bottom row, how many total cans are on the bottom 14 rows?
3. A major US city reports a 12% increase in decoration sales during the yearly holiday season. If decoration sales were 8 million in 1998, how much did the city report in total decoration sales by the end of 2004?
4. A fireplace contains 46 bricks along its bottom row. If each row above decreases by 4 bricks, how many bricks are on the 12th row?

Answer 2

no one wants to help me :(

Answer 3

Sara
Idk how to answer this but ask either @dpalnc or @ParthKohli or @Hero.. either one of them might answer your question.. lol..
If they're BUSY or NOT..
just ask them..

Answer 4

1.
In February He deposited : 5
In March : 5*2 = 10
In April : 10*2 = 20
In May : 20*2 = 40
In June : 40*2 = 80
In July : 80*2 = 160
In August : 160*2 = 320

Answer 5

i don't need to solve it

Answer 6

It is a Geometric Sequence...

Answer 7

Common Ratio = 10/5 = 20/10 = 40/20 = 2

Answer 8

@sara1234please post one question at a time, tell me which one you don't get

Answer 9

i just need to know what formulas i need to use to solve each of them don't need help solving

Answer 10

cool, let's start with first one

Answer 11

Jackie deposited $5 into a checking account in February. For each month following, the deposit amount was doubled. How much money was deposited in the checking account in the month of August?
Feb=5
Next month it'll get doubled
March=10
April=20
and so on
we see the amount is in the sequence
5, 10, 20, 40....
so it's a geometric sequence with common ratio 2. Now you just need to figure out the amount in august
feb= 1st month
aug= 7th month
Use the nth term formula
\[a_n=a_1r^[n-1}
here a_n is amount in august
a_1= amount in feb
r=2
tell me what's n here?

Answer 12

The second one is Arithmetic Sequence with a common difference of two as each row on above is getting added by cans..

Answer 13

@sara1234 do you get this?

Answer 14

i don't need to solve it @ash2326

Answer 15

But you did understand, didn't you?