Recent content by acen_gr

The title says it all. Say you have 5 rings, each weighing 18 grams (10% alloy and 90% gold). If you would melt them all and add silver to make it 75% gold, 1) how much silver do you have to add? 2) Does melting 5 rings with 18grams each give 90 grams in total? 3) is this equation...

let x = wind speed still air speed = 150 mph tailwind time = 2 1/3 hours tailwind speed = 150 + x headwind time = 3 1/2 hours headwind speed = 150 - x d = rt tailwind: d = (150 + x)(2 1/3) d = 100 + 2 1/3 x headwind: d = (150 - x)(3 1/2) d = 225 - 3 1/2 x d = d 100 + 2x/3...

Homework Statement A Cessna 150 averages 150 mph in still air. With a tailwind it is able to make a trip in 2 1/3 hours. Because of the headwind, it is only able to make the return trip in 3 1/2 hours. What is the average wind speed? Homework Equations (1) If x = wind speed and y =...

You mean, you learned to solve anything because you have already encountered them? Or the opposite? So, I should have studied a lot in algebra, trigo and calculus?

Yes! I made it right. I just wonder if my understanding was right because I'm not from an English-based country so some phrasing are not clear to me. Thank you everyone! :biggrin:

Really? How come you seem to know a lot in math? Have you just memorized everything about math? EDIT: Wee I'm so encouraged to work hard in math...knowing that even a math student can also be as good as teachers, and sometimes BETTER. I wish I could be like you too. You're a student like me yet...

Ok sir so if my interpretation of the problem is right, then it would be right if I answer choice B right? Thank you! :smile:

I truly agree with you sir. That's why I rather choose to drop all my subjects and just study by myself here than to listen to him who even doesn't know what he's saying. He's making us fail in class by teaching us easy examples and giving out hard tests. Glad that I found this site where I can...

Homework Statement A ship is d feet from a dock (horizontal distance). The dock is 40 feet above sea level. The angle of depression from the dock to the ship is θ. Write θ as a function of d. Homework Equations This question is accompanied with choices. The choices are (A) θ = 40arctan(d) (B)...

:smile: that should be this: Sorry about that. I labeled the green line first as y = 1 and accidentally labeled the second one y = 2. What a mess. So, the solution set is: x = {0°, 90°, 180°, 360°} Thank you so much sir! I had fun learning with you. You are good in teaching. I...

How about this? I hope this one got it right:

Oh yeah I forgot that I have to draw only 1 period. Apologies~ :-p Working on graph..

Do you have any clue of the correct curve for sin x? because that's the only sinx graph that I know.

Yeah, and also the point at 360. Sorry :shy: Based on the graph, the x values are 0°, 45°, 90°, 225°, 360°. Right?

This?