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Ryan kustin
Questions (10)
A Norman window has the shape of a semicircle atop a rectangle so that the diameter of the semicircle is equal to the width of
9 answers
2,951 views
Suppose the derivative of a function f is f′(x)=(x−5)^3(x−3)^4(x+18)^8. Then the function f is increasing on the interval
C
1 answer
553 views
Consider the following function f(x)=x^2/[x^2-9]
f(x) is increasing on the interval(s) f(x) is decreasing on the interval(s) f(x)
1 answer
632 views
Consider the following function f(x)=x^2/[x^2-9]
f(x) is increasing on the interval(s) f(x) is decreasing on the interval(s) f(x)
2 answers
614 views
The half-life of Kryponite-123 is 40 years. Suppose we have a 700-mg sample. Find the decay k, and the expected amount of
1 answer
466 views
a bottle of water with temperature 70 F is placed in a refrigerator with an internal temperature of 34 F. After 30 minutes, the
2 answers
2,499 views
the population of deer in a certain area of cabarrus county grows proportional to itself. the population of deer in 2000 was
4 answers
1,193 views
Use this observation and the linear approximation to estimate (15.9)^1/2
I know the answer is 3.9875, I just need someone to
1 answer
417 views
gravel is being dumped from a conveyor belt at a rate of 15 ft^3/hr and its coarseness is such that it forms a pile in the shape
4 answers
4,445 views
A balloon, 50 feet from an observer is rising at 20 ft/sec. At 5 sec after lift off,
a)how fast is the distance between the
3 answers
839 views
Answers (15)
Let x be the width and y be the height of the window. So the radius of the semicircle at the top is r=x/2. The perimeter 31=x+2y+πr . So x+2y+πx/2=31. Solve this equation for y. The area A=xy+12πr^2=xy+1/2π(x/2)^2. Eliminate y from A by substituting y
Hey, Damon, can you please look at my reply on my problem?
Whoops I forgot to square the second part, but it still did not produce the correct answer I got 66.9.....
Hey, I went back and got the exact value, because the answer isn't coming out correct on the practice program. I did 15.5(8.637013338)-.8973009183(8.637013338) and I got 126.1237067 and that is still incorrect. I'm not sure what error I am making. I hope I
Oh okay, I guess that's what I was doing wrong.
I plugged in 8.64 * 4.4+.5(pi8.64^(2/4)), I'm sure that's how you find the solution
Thank you for my help. Can you explain what to plug in to get the answer? My calculus teacher told me this is one of the harder problems, and it wouldn't be on the final. Despite this, I'm still really lost on exactly what this question is asking. This is
Can you please explain what you mean by when f'(x) > 0. I know you should be able to just graph it and see when it's increasing and decreasing, but for some reason I cannot get the correct answer. Can you please explain increasing and decreasing, concave
for part a I got k = -.023105, if this isn't correct, can someone explain what I did wrong? how do I now find p(t)?
I got 89.67 by using 45e^(ln(65/45)/8*15)
I meant .046 not .045
wow, I actually did it right, I got .045 for k, and p(t) = 89.67. I can't believe I actually did this problem correctly, I hope.(crosses fingers)
oh okay, I ended up getting .43ft/hr. I'm 99% sure that's the correct answer. Thanks for clearing that up for me, I'm really sucking at related rates, so I'm doing all the problems I can.
How did you get "dh/dt = 135/(100π) ft/hr?" That's the only part I'm confused about. Thanks for your help btw.
Thanks for your help, but sorry, I'm still kinda confused. I'm not sure how to find x. Do I need it to solve for z. z^2 = 50 ^2 + x^2 Sorry if this is a silly question