Asked by Gabby

Find the value of the expression below for r=4 and t=2.... t^3-r+20 divided by r

9***
72
6
40



Ok, Reiny you said my answer9 was originally wrong, however when I looked at the work you did and you put in parenthesis()....my question is why, because the original expression didn't have any...
Answered by Gabby
P.S. I'm not saying Reiny is wrong I'm asking so in the future I can know why.
Answered by Steve
(2^3 - 4 + 20)/2 = (8-4+20)/2 = 24/2 = 12
2^3 - 4 + 20/2 = 8-4+10 = 6

The parens make a big difference.

Just FMI, how did you get 9?
Answered by Gabby
Ok, well first of all.. I turned it in and got a 50% and my answers were correct... second of all I got 9 by doing exactly as told I plugged in the numbers so.. 2^3-4+20/4 then did then did the exponent and then got 8-4+20/4 put that in to a calculator and got 9.... maybe I should have listened to the calc. :(
Answered by Gabby
Now my grades a C...
Answered by Steve
Ouch! you are correct. I divided by t, not r.

Not only should you have listened to the calc, you should have noticed my typo. We try to help, but we're not always perfect; check our work not just the answers...
Answered by Anonymous
the right answer was 9.
for the whole quick check-
D-0.064
A-$30
D-3
A-9
Answered by Bobby
Anonymous is correct i just took the quick check and got a A.
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