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1. The height (in meters) of a projectile shot vertically upward from a point 4 m above ground level with an initial velocity of 25.5 m/s is h = 4 + 25.5t − 4.9t^2 after t seconds. (Round your answers to two decimal places.) So, I found its velocity, maximum height, and how long it takes to...

First, he multiplied 6x + 10yy' with 1/3x^2 + 5y^2 by means of distribution. You made a mistake by subtracting 10yy' while it is in a parenthesis with 6x. You needed to multiply the entire thing with the outside fraction first. So, yours should have been 6x/u + 10yy'/ u. I am pretty pretty sure...

No, this is what I put. Sorry, I stayed up all night doing other homework so I was sorta half as sleep when I typed. :(

Would the answer for that question be the same, regardless of whether or not the 7x is outside the radical? The webassign said the answer was wrong. My answer was ((7sqrt x)^7x / 2) + (ln (x)+x). Yes, I have read what you wrote carefully. I did show my attempt at solving the problems, as poorly...

So the answer would be the same? Why would it say the answer was wrong, then?

Can someone help me with this one?

Um, actually, the first one is also wrong because the 7x is outside the square root, not together with x. I used up my last try for that, too. XD The second one, I am not sure as I can't check, but it looks correct. I appreciate you two for trying to help, though. I couldn't spot the mistake...

First one: I think that I have to put 4sqrt(1+2x) - 0.1 < 1+1/2x < 4sqrt(1+2x) + 0.1. I don't know what else to do after that. Second one: I found y' = 1/2 (x)^-1/2, since x = 1, I just plugged it in. I don't know how to find delta y or graph them.

I know how to do a normal problem with that function, but this is different. It's square root 4 of 1+2x about equal to 1+1/2x. I am supposed to determine the value of x within 0.1 The second problem is delta x and y. y = square root x, x = 1, and delta x = 1. I found dy, but I don't know what...

Can someone explain to me how to do these two problems? My idiot teacher couldn't explain a single thing, the textbook instructed me some nonsense and told me to use a calculator, other sources on the internet were too complicated. I don't even know where to start. :-x

Was it correct to move the 10yy' to the left like that, though? I think you were multiplying the entire 1/u with 6x + 10yy', so something is fishy there. :confused:

No, that was wrong. And I have used up all my tries, so I lost point on that question. :( Thanks for telling me. I didn't realize that. :D I am not sure what else to do for these two. Any hints? :?: The answer was my first try. x^(-1/2)(7x)' Ridiculous, I know. XD

Hi guys, :D I am stuck on these two log derivative problems. For the first one, I tried using ln to solve it. (7x ln sqrt(x))' = 7 ln sqrt(x) + 7x (1/sqrt(x)) (1/2) (x)^-1/2. For the second one, I think I have to solve it with implicit diff. y' = 2ln(3x) + 2ln(5y) y' = 2(1/3x)(3) +...