Question

Evaluate the given expressions. All numbers are approximate. 15.66^2-(-4.017)^4/1.044(-3.68)
how do i do this?

Answer 1

@campbell_st i have to do it by significant digits to gethe correct answers

Answer 2

well type it into a calculator as

\[15.66^2 - \frac{(-4.017)^4}{(1.044 \times -3.68)}\]

Answer 3

campbell_st
that looks a LOT better that way

Answer 4

so once you get an answer, then identify the significant digits

Answer 5

i did that and i got -15.14422269/-3.84192 and this equals 3.941

Answer 6

but not sure if its right

Answer 7

ummm I got 313.0089...

Answer 8

cause my teacher had one similar to this 1328^2-(-7.023)^4/1.037(-2.01) = -2256/-2.08437= 1082.341427=1080 i guess do to signifigant digits

Answer 9

Yes Ijust got the same answer 313.0089588132

Answer 10

Ash90 - Is the way you typed that exactly the same way as campbell_st retyped it?

Answer 11

let me double check

Answer 12

so lets assume 313.0089... is the answer... how many significant figures do you need to answer to?

Answer 13

i didn't get that. but if 131.0080 is the answer you would need 4 signifigants correct?

Answer 14

Ash90 - provided that campbell_st didn't misunderstand what you had typed

Answer 15

sorry i get 131.6048806

Answer 16

Or me for that matter

Answer 17

but you would need 4 sigs right?

Answer 18

well for significant figures... the rule is find the 1st non zero digit... then count form there

in your example its 1 then count 4 digits its 131.6 look at the digit after the 6 and apply the rounding rule... 0 so no change

so the answer would be 131.6

Answer 19

but you need the answer correct too

Answer 20

yes i do wolf and campbell i yes it would be131.6 i see how you got that

Answer 21

So, Ash90 is this how you are doing your calculations?

Answer 22

yes

Answer 23

Well that would expxplain a LOT

Answer 24

yeah

Answer 25

Want to work that out right here? I'll do the posting.

Answer 26

correct

Answer 27

15.66²=245.2356

Answer 28

-4.017^4 = 260.3798226915

Answer 29

4.017^4= yes correct

Answer 30

so far so good

Answer 31

1.044 * (-3.68) = -3.84192

Answer 32

yes i have that too

Answer 33

Okay so we have (245.2356 - 260.3798226915) / -3.84192

Answer 34

245.2356-260.3798226915=15.14422269

Answer 35

I get + 15.1442269

Answer 36

-15.14422269/-3.84192=3.941837074

Answer 37

the answer will be 3.941837074 or a negative of that number right?

Answer 38

I get 3.941837074

So, we agree on the final outcome.By the way I notice you automatically change 15.1442269 to negative 15.1442269 in the next step.

By the way it is definitely a positive number3.941837074

Answer 39

Gee I wish these posts were numbered - it would be so much easier to say - 'see post 27'

Answer 40

haha lol and thanks a lot

Answer 41

ans so for the sig we get 3.942 correct

Answer 42

By the way, here's the post where you have the positive number 15.14422269
245.2356-260.3798226915=15.14422269
(You turn it negative later on).

3.941837074 = 3.942
Yes, that would be it to 4 significant figures

Answer 43

okay gotcha later on switch the sign

Answer 44

Okay but the answer is definitely positive.

Answer 45

yes

Answer 46

thanks

Answer 47

u r welcome