Question

i need some to please help me asap

Answer 1

help you with wat

Answer 2

#35 "A person hired a firm to build a CB radio tower. The firm charges $100 for labor for the first 10 feet. After that, the cost of the labor for each succeeding 10 feet is $25 more than the preceding 10 feet. That is, the next 10 feet will cost $125, the next 10 feet will cost $150, etc. How much will it cost to build a 90-foot tower?"

Answer 3

im getting 300 as my answer

Answer 4

if you need me to supply you with the atachment that my instructor gave me i will

Answer 5

pross do you think you can help me

Answer 6

Do u mind me calling you star

Answer 7

im getting an answer of 1800...

i worked it out the long way though

im trying to find a way to explain it through sequences

Answer 8

okay im also going to need to show me the long way cause i was coming up with 300

Answer 9

ok...so lets try and work through this

10 ft = 100
20 ft= 125
30 ft = 150
40 ft = 175
50 ft= 200
60 ft = 225
70 ft = 250
80 ft = 275
90 = 300

so if you were to add all those up youd get 1800

though its pretty time consuming and im sure there is another way

Answer 10

the \[an=a1+(n-1)d\] is what they have us using

Answer 11

actually yeah, i just had a look at the attachement and youre supposed to use series

do you know how to use that equation

as that would give you 100 + (n-1)25

Answer 12

Sorry i know that it seems really bad and again im sorry my instructor is being pickie

Answer 13

yes i do but i have never had to show my work before not even in High school

Answer 14

brb

Answer 15

ok im back

Answer 16

so your formula for the sequence would be 100+25(n-1)

and your aritmetic sequence would look something like this

100,125,150....

with a common difference of 25

so since you know that

1st term = 10 ft
2nd term=20 ft
etc...

that means that the 9th term = 90 feet right?

so you then have to use another formula

for the sum of terms its something like : Sn = [n(A1+An] / 2

ok?

Answer 17

sn=n\[Sn=n(a1+a18) divided by 2\]

Answer 18

yes

where Sn = the sum of terms (or in this case the total amount paid)

Answer 19

okay

Answer 20

so youll need A1 = 100

and An = 9 because the 9th term is the 90 feet one right

but we dont have An...so we put 9 back into the first eq to find the value of the 9th term

and get...100+25(9-1) =300

Answer 21

once you are done showing me can you show me what it should look like when im done writing it all out

Answer 22

i know that im being a pain but i have never had to show my work

Answer 23

would you like me to send the attachment that im looking at?

Answer 24

:D ...ok

anyways...to keep it short...

you have A1 = 100
and An = 300
and n =9
so put it back into the 2nd eq to get the total

which would be: ---> 9(100+300) divided by 2 = 1800...thats your answer :)

Answer 25

its cool...ive already got the attachment...the one at the top right?

Answer 26

yes

Answer 27

so...to answer your questions...

1)show the sequence: the sequence is:---> 100 + (n-1)25

and

2) the cost to build the tower is : $1800

Answer 28

so the sequence is: arithmetic

Answer 29

yep :) and for the working just put in the equations that you used and show how you substituted the values

Answer 30

i have never done that

Answer 31

i have always done it in my head

Answer 32

you see why im having trouble

Answer 33

right...

1) show the sequence: 100,125,150...etc

2) show that the common diff is 25

3) then show how you used the formula: a1+(n-1)d by substituting the values

4) show how to you got An by substituting n for 9

5) then show how you used the formula: n(a1+An) / 2

and show that you got the total cost as 1800

that should be sufficient :)

Answer 34

STEPS/CALCULTATIONS YOU PERFORMED TO REACH THE ANSWER:

Answer 35

yep, those are the above...i think they should be ok

Answer 36

they are asking for the steps showing how i ended up with 1800

Answer 37

they want the math

Answer 38

and that was what i was showing you with all those equations and all...tell you what, if you really know...just try and work through it and use the equations as a guideline

Answer 39

or you could also check out this site

http://regentsprep.org/Regents/math/algtrig/ATP2/ArithSeq.htm

Answer 40

Misti are you still needing help with this?