Recent content by omg precal

3^5 is indeed 243. Thanks, Doc Al.

Thanks!

that gives me 3^x = 243. using logarithms... x log3 = log 243 x = log 243/ log 3 x = 5 am i correct?

that's what the inverse does to the function?

First of all, sorry for asking so many questions. I do not want answers, just a method of solving them. Homework Statement For the exponential function f(x) = ab^x, suppose f(2) = 2 and f(4) = 18. a. Find a and b. b. Find f^-1(54), the inverse function. Homework Equations None...

Cost Function = 16l + 16h + 4lh Cost Function (h) = 160/h + 16h + 40 Height = 10 Length = 1 Width = 4 16(10) + 16(1) + 4(1)(10) = 216 dollars 16(100) + 16(0.1) + 4(0.1)(100) = 1641.60 dollars (smaller you go, much bigger the price gets!) 16(5) + 16(2) + 4(5)(2) = 156 dollars...

This is, by far, the hardest summer assignment I've ever had... But thanks to you guys, I managed. =]

Wow. I was blinded by stupidity. Thank you! No problem at all. Thanks a lot for helping, though.

:confused::confused::confused: wouldnt 0 length mean it is 2-dimensional? infinity height... that would be tall :smile: I think I'll just leave it blank. o.O

and wouldn't that also screw up my domain for H? or would it be all real numbers lol

yeah... i spent a good hour trying to find some kind of non existent hint in the wording or just simply another solution, but i couldnt. i just hope my teacher made a mistake, i don't want to do bad on it.

done em all, thanks roco

thats exactly what i thought. my parents even thought that, and i came here in hope of a better response =p this is copied exactly from a precalculus summer assignment. I have put 0.00...0001 as my answer so far, idk what to do. thx so much again.

OMG you own life! thanks a lot man

ok i think i vaguely remember that if u add logs with the same base, you can multiply what is in the log. that woiuld make it: log base 4 of x^2 - 9 = 2 meaning 16 = x^2 - 9 meaning x^2 = 25 meaning x = 5 hooray, thanks!