Recent content by pbonnie

Wow that's embarrassing.. thank you! I guess it's time for a break

or if it's supposed to be 10\cdot\sqrt{x^2+14400} = 15x

Oh, okay, well then I guess it was actually the next part that I wasn't sure how to do! My attempt from there was: 10 = \frac{15x}{\sqrt{x^2+14400}} 100 = \frac{15x}{x^2+14400} I'm going to stop there for now in case I'm already making the mistake?

Homework Statement A new cottage is built across the river and 300 m downstream from the nearest telephone relay station. The river is 120m wide. In order to wire the cottage for phone service, wire will be laid across the river under water, and along the edge of the river above ground. The...

Ah thank you both very much. I wrote down the 1/2mv^2 in my actual work but forgot to do the calculation. Thank you:)

Homework Statement In a TV tube, an electric potential difference accelerates electrons from a rest position towards a screen. Just before striking the screen, the electrons have a wavelength of 1.0 x 10^{-11} m . Find the electric potential difference.Homework Equations λ = h/mv ΔE_k = qΔV...

* % purity = 0.324g/0.500g = 64.8%

Homework Statement Calculate the number of moles and the mass of ASA in one tablet. Determine the percentage of the original mass of the tablet that was actually ASA. (this question was based off an experiment previously in the lesson)Homework Equations c = n/v n = m/MThe Attempt at a...

Oh okay, I tried it on a different graphing program and it worked. Thank you both! For a part b of the question, it asks for the location of any maximum or minimums. Because it is constantly increasing, this means there are no maximum or minimum values?

I did type in the f(x) function, which has intervals of increase AND decrease.. which is why I'm not very confident in my answer. But now I'm stuck as to how to figure out the correct answer. I'm doing an online course and it hasn't explained this part.

Homework Statement For the function f(x) = x^3 - x^2 + 4x - 3 Homework Equations The Attempt at a Solution I found the first and second derivative, the first derivative is f'(x) = 3x^2 - 2x + 4 This is not factorable, as the discriminant is < 0, meaning there is no...

oh.. or just h'(x) = 3e^{sin(x+2)}(cos(x+2)) Since it's of the form f(x) = a^{g(x)}?

This is me attempting to get back into math after 5 years, I'm quite rusty, I'm relearning everything so I forget sometimes. Okay, so then the derivative of the exponent of e would be cos(x+2) ? So it would be h′(x)=sin(x+2)(3e^{sin(x+2)−1})(cos(x+2)) ?

Homework Statement Find derivative of: h(x) = 3e^{sin(x+2)} Homework Equations chain rule of derivatives, product rule(?) The Attempt at a Solution I'm quite sure I'm doing this wrong. Because the exponent is a product, for the derivative of the exponent I would have to use the...

Oh I'm not sure how I managed that. Thank you :)