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1. ### (Uniformly mixed) Is my work correct for a linear ODE mixture problem? A 400 gal tank initially contains 50lb of salt. 1lb/gal enters the?

. let t = time, Q = amount and V = volume Initial conditions: V₀ = ? Looking at your answer I assume you are given initial volume as 100 V₀ = 100 gal Q₀ = 50 lb dV/dt = 5 - 3 dV = 2 dt V(t) = 2t...

2 Answers · Science & Mathematics · 12/08/2019

2. ### If a van travelled 10000 km/hr and passed in front of you, could you see it?

...150 frames per second At 10000 km/hr, that's 10000/3600 km/sec => 100/36 km/sec => 25/9 km/sec, or about 2.7777.... km/sec The human...

10 Answers · Science & Mathematics · 08/08/2019

3. ### Math ? Sound travels about 750 miles per hour. If you stand in a canyon and sound a horn, you will hear an echo.?

... .... 1 hour ------------- x -------------- x -------------- 1 hour ........ 1 mile ........ 3600 secs 750 * 5280/3600 = 750 * 22/15 = 1100 ft/second Now you are ...

2 Answers · Science & Mathematics · 28/07/2019

4. ### Solve the following equations for x if 0 < x < 2pi 3sec x + 6 = 0?

3sec(x) +6 = 0 sec(x) = -6/3 1/cos(x) = -2 1 = -2cos(x) -1/2 = cos(x) Now, what values of x is such that its cos it -1/2? This you should know by heart or to consider your unit trig circle; the answer is in it. Done!

3 Answers · Science & Mathematics · 25/07/2019

5. ### MATH QUESTION IMMEDIATE HELP PLEASE! ***I cannot expand the graph for some reason...whatever you can get from it is greatly appreciated***?

appears to be a secant graph with period 24π.....f(x) = 4 sec ( x / 12 )

1 Answers · Science & Mathematics · 15/07/2019

6. ### How do you graph y=sec(1/3x+pi)? I know how to get the period and amplitude, but I am confused on how to find asymptotes.?

y=sec(x/3+pi)=> y=-sec(x/3)=> y=-1/cos(x/3) The period T=6pi There is...

5 Answers · Science & Mathematics · 18/08/2019

7. ### Find the general solution of the diff. eq. and state the interval in which the general solution holds true?

... sin(x) y = sin(x)/cos(x) + C y = 1/cos(x) + C/sin(x) y = sec(x) + C csc(x) ━━━━━━━━━

1 Answers · Science & Mathematics · 26/06/2019

8. ### COLLEGE ALGEBRA HELP!!!!!?

College??? We worked that problem in 8th grade. Rock dropped into a well.

3 Answers · Science & Mathematics · 24/06/2019

From 0 sec to 2 sec he rose 3 feet when he should have risen only 1 foot...

2 Answers · Science & Mathematics · 18/06/2019

10. ### If cot x = -1/2 and it is in the fourth quadrant what is cos X?

tan(x) = -2 sec(x)^2 - tan(x)^2 = 1 sec(x)^2 - (-2)^2 = 1 sec(x)^2 - 4 = 1 sec(x)^2 = 5 cos(x)^2 = 1/5 cos(x) = +/- sqrt(1/5) cos(x) = +/- sqrt(5) / 5 cos(x) > 0 because we're in Q4 cos(x) = sqrt(5)/5

4 Answers · Science & Mathematics · 17/06/2019