04/26/16

An airplane heads due west with an airspeed of 84 m/s. Because of a wind...
An airplane heads due west with an airspeed of 84 m/s. Because of a wind blowing due north, the speed of the airplane relative to the ground is 98 m/s. What is the wind speed? (ans: 50 m/s toward... more
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04/20/16

A particle moves on a line away from its initial position so that after t hours it is s = 2t^2 +3t miles from its initial position.
Find the average velocity of the particle over the interval [1, 4]. Include units in your answer.   Thank you!!
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04/18/16

Evaluate each limit, if it exsists.
Here are some examples of questions in the textbook that I don't know how to do for my test!   Evaluate each limit:   lim (x approaches 0) tanx/x     lim (x approaches 0)... more
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04/18/16

help me solve this problem?
suppose that when a particular drug is injected, the concentration is 1.5mg/mL. After 4 hours, the concentration has dropped to 0.25mg/mL. Solve for the decay constant, k, and write an exponential... more
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04/17/16

Which has more momentum? What momentum does the car possess relative to the truck and Track relative to the car?
A car weighing one ton is moving at 50 km/hr and a truck weighing two tons is moving at 25 km/hr. Both car and the truck are moving in opposite directions.
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04/12/16

would it take more .1m hcl or .1m h2so4 to neutralize 30 ml of naoh
i dont understand how to set up this problem and why? would it take more .1m hcl or .1m h2so4 to neutralize 30 ml of naoh
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03/29/16

Population Grows
A population grows exponentially according to the differential equation dp/dt =kp, where P is the population, t is time, and k is a positive constant. If P(0) = A, what is the time for the... more
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03/29/16

plane can fly 260 miles in the same time as it takes a car to go 100miles as the car travels 80mph slower find the speed of the plane.
I know the formula to use but am very confused on how to set it up
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03/29/16

How do I cancel
We have been using Miss Bev for a while now and we are very happy with her, but have decided it is time to discontinue our sessions.
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03/22/16

In the laboratory you dissolve 21.2 g of nickel(II) bromide in a volumetric flask and add water to a total volume of 375. mL. ??What is the molarity of the solu
college chemistry
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03/22/16

How many milliliters of an aqueous solution of 0.167 M potassium nitrate is needed to obtain 12.0 grams of the salt?
college chemistry
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03/21/16

find the mass that was burned
C2H6 + O2→CO2 + H2O. The heat from this reaction vaporized 20 grams of water. What mass of C2H6 was burned?
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03/03/16

how to do this equation? I got it wrong?
Factor the following.2a^3b-18ab^3     isn't the GCF 2 and a?  
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02/25/16

at what rate is the supply changing?
Suppose the wholesale price of a certain brand of medium-sized eggs p (in dollars/carton) is related to the weekly supply x (in thousands of cartons) by the following equation.$ 625p^2 - x^2... more
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02/25/16

CALCULUS HELPPPP
A storage tank at a factory collects liquid waste and can be drained by opening a drainage valve at thebase of the tank. The depth, d(t), of fluid in the tank t hours after the valve is opened is... more
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12/07/15

what does the discriminant tell you about the solutions of the function?
Calculate the discriminant of f(x)=2x^2-7x+10 
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11/27/15

area question 2
Find the area of the region between two curves below. (Hint: the answer is not 0)   y=x^3 y=x
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11/15/15

Find the limit. Use l’Hospital’s Rule where appropriate. If there is a more elementary method, consider using it. If l’Hospital’s Rule doesn’t apply, explain wh
Find the limit. Use l’Hospital’s Rule where appropriate. If there is a more elementary method, consider using it. If l’Hospital’sRule doesn’t apply, explain why.   lim (x --> pi/2 +)    ... more
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11/14/15

Calculus Differentiation
Differentiate y=(x2+1)e((-x^10)+3x)
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11/14/15

natural logarithms
Let f(x) = ln(ln(x)). Find f' (e4)
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10/28/15

Use linear approximation to estimate the number 1.999^4
Use linear approximation to estimate the number (1.999)4   That means: a = 2 f(2) = 16 f(1.999) ≈ ?     16 + 8(2)3 * .001 f(1.999) ≈ 16.064   However, this is not the right answer... more
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10/27/15

Find the limit of (x --> 0+) coth(x)
lim (x --> 0+) coth(x)   I get :   2e0 + 2e-0 _________ 2e0 - 2e-0   =  4/0   But you can't have a zero in the denominator. What have I done wrong?   #23(g), p263 ANSWER:   ∞
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10/22/15

At 20 °C (approximately room temperature) the average velocity of N2 molecules in air is 1050 mph
What is the total kinetic energy of 1 mol of N2 molecules moving at this speed?Express your answer using four significant figures.
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10/22/15

The pH of a solution is determined to be 7.0.
The pH of a solution is determined to be 7.0. What is the hydronium ion concentration of this solution?
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10/22/15

Determine the hydronium and hydroxide ion concentrations in a solution
Determine the hydronium and hydroxide ion concentrations in a solution that is 2.0 × 10-2 M NaOH.
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