Question

Please please help. I am trying to solve this problem and the answer is 145.58 but for some reason I am not getting that answer.

(9000)[12+ (1/2)(60000/7200) + (1/900)(60000/7200)]

Answer 1

give me a sec plz.

Answer 2

thank you! i think I'm calculating the wrong numbers first

Answer 3

Are you starting from the inside and working your way out?

Answer 4

yes. I multiply (1/2)(60000/7200) first then i add 12. then i multiply (1/900)(60000/7200) and i add that value to my first value. then i multiply the number i get with 9000

Answer 5

No.

Answer 6

you do all multiplication first

Answer 7

then addition

Answer 8

then multiply what is on the outside by the inside total

Answer 9

let me show u an example

Answer 10

ok thank you an example would help:) ill try it right now again

Answer 11

it will take a minute hold plz lol

Answer 12

ok!

Answer 13

-9[5(1/2)(2/3) + (3/4)(2/4)]

here is the problem

Answer 14

multiply 1/2 with 2/3

Answer 15

(First)

Answer 16

then: multiply 3/4 with 2/4

Answer 17

you find the answers i will tell you the steps

Answer 18

ok i will try it right now

Answer 19

ok

Answer 20

can i do (1/2)*(2/3) in the calculator?

Answer 21

yes i do that lol

Answer 22

ok so i got .3333333333 and when i do (3/4)(2/4) i get .375

Answer 23

okay found .33333... to the nearest tenth

Answer 24

ok

Answer 25

add your answers together

Answer 26

ok i get .7083333333

Answer 27

round that to the nearest tenth

Answer 28

then multiply that answer by 5.
then finally multiply that total by -9
and you have you answer!

Answer 29

ok i see what you're doing with that problem. When i try it with my problem i end up with 9000[12 + 4.166666667 + .0092592593] am i supposed to round those numbers before i multiply to 9000?

Answer 30

yes

Answer 31

then add them all up before you multiply the #s

Answer 32

by 9000

Answer 33

so would 4.16666... rounded be 4.167? and .0092592593 be .00926?

Answer 34

what r u supposed to round to? do u know?

Answer 35

or does it say anything about it?

Answer 36

well the only thing i know is that 60000 is in ms and the answer is supposed to be in seconds

Answer 37

ok

Answer 38

the answer is 145.58 seconds

Answer 39

what does the entire problem say?

Answer 40

The problem is a computer problem and we plug in those numbers according to a table that has the seek time, rotational delay, and track size. The numbers are all plugged in correctly in the formula which is Tavg= (# sectors)[Ts +(1/2)(1/r) + (1/s)(1/r). So the numbers I plug into that formula..

Answer 41

ok

Answer 42

hold on

Answer 43

lemme do it on paper

Answer 44

The second one i'm supposed to calculate is (9000)[8 + (1/2)(60000/5400) + (1/750)(60000/5400)] and the answer is 122.13 seconds. I will try this one to see if I get the answer maybe my teachers answer to the first one is wrong

Answer 45

ok thank you

Answer 46

i get the answer 111,780

Answer 47

from the first set of numbers

Answer 48

@iambatman plz help?

Answer 49

oh ok

Answer 50

sorry. I am not that great at math either... XD

Answer 51

lol its ok thank you for helping anyway

Answer 52

Np anytime!

Answer 53

Good luck!

Answer 54

thank you!

Answer 55

;) u r welcome

Answer 56

@iambatman can you please please help me with this problem..

Answer 57

just had to divide the answer by 1000:)