Question

jon is comparing two checking accounts. one has a monthly fee of $7 per check-fee of $0.30 and the other has a monthly fee 0f $4 and a per check fee of $0.40. what is the minimum number of checks jon needs to write for the first account to be a better option? HELPP!

Answer 1

well compute the number of checks at which the two accounts cost the same.

Answer 2

if you write X checks, how much does the first account cost?

Answer 3

wait kan u help mi on another problem instead?

Answer 4

checking account a charges a monthly service fee of $2 and a per check fee of$0.30 while checking account b charges a monthly service fee of $3 and a per check fee of $0.20 how many checks would a person have to write for the checks to be the same?

Answer 5

okay....? same problem. can you write an expression for how much the first account will charge if you write X checks?

Answer 6

it says 31, 0 ,20, or 10 checks

Answer 7

okay that doesn't matter. if you write X checks, how much does account 1 cost?

Answer 8

hello?

Answer 9

yea

Answer 10

srry i dnt get wat ur tryin to say

Answer 11

for account 1, if you write X checks, how much will account 1 cost you?

Answer 12

if u write 5 checks wont it cost $1.5

Answer 13

how did you get that?

Answer 14

um multiplyed 0.30 X 5

Answer 15

okay you're close, so for "x" checks (instead of 5) how much will it cost?

Answer 16

let's call it "c" checks instead of x so it's less confusing, since "x" also looks like a multiplication symbol. If you write 'c' checks, how much will it cost?

Answer 17

if i write 4 c?

Answer 18

0.30 c

Answer 19

plus the monthly fixed fee, which is how many dollars?

Answer 20

2.3 dollars

Answer 21

where did you get that from

Answer 22

0.30 +$2

Answer 23

huh? where did $2 come from?

Answer 24

from the monthly fee

Answer 25

that's $7, not $2

Answer 26

ohh dis hole time i was asking for help on the oter problem

Answer 27

okay so if you write 'C' checks, the fixed fee is $7, and the per-check fee is $0.30, how much does it cost? can you write that expression?

Answer 28

oh, i see.. okay, let's do the second problem, the fixed fee is $2 and the per-check fee is 0.30 dollars, so how much is it if I wrote "C' checks?

Answer 29

do i add 0.30+$2

Answer 30

no, that's if you write one check. what if you write C checks?

Answer 31

so i multiply dem?

Answer 32

multiply what?

Answer 33

0.30x$2

Answer 34

no, why would you do that? how much would it cost if you wrote 2 checks

Answer 35

$4.3?

Answer 36

don't do the math, just write the equation

Answer 37

four dollars

Answer 38

what? no, it's two dollars plus 0.30 dollars per check

Answer 39

it's the price per check times the number of checks you write

Answer 40

plus the fixed cost per month of $2

Answer 41

can you wrte it out its kinda confusing

Answer 42

do you understand that?

Answer 43

were did u get 7

Answer 44

sorry i meant 2, i got it mixed up with the other problem

it's 0.30 * C + 2

Answer 45

ok bt wat goes in number of checks

Answer 46

that's what we're trying to solve, so just keep it as an unknown for now, called C

Answer 47

do you understand that?

Answer 48

yes

Answer 49

for any number of checks, which we'll call C, it costs 0.30 * C + 2

Answer 50

okay now how much does the other account cost if you write C checks?

Answer 51

0.20* c +$3

Answer 52

yeah. now we want to find out when the two accounts cost the same, so set those two expressions equal to each other and then solve for C

Answer 53

can you write that?

Answer 54

wit i dnt get it

Answer 55

write the cost of the first account, then an equals sign, then the cost of the second account

Answer 56

wait i tink i found the anser

Answer 57

i did 0.30x10 +2=5

Answer 58

christ, if you just wanted the answer i could have told you that an hour ago. i thought you wanted to learn how to do it

Answer 59

n 0.20x10=5

Answer 60

sorry tanks

Answer 61

i know how to do it now tho

Answer 62

no, we didn't actually solve it yet!

Answer 63

we didnt?

Answer 64

no, we have to take the two expressions for the costs of the two accounts, and set them equal to each other, and then solve for C

Answer 65

how do u do that

Answer 66

write the cost of account one, write an equals sign, then the cost of account 2

Answer 67

tanks ill get on soon i hav to get off