06/29/16

number of tangents
Find number of points where tangents does not exist for the curve y =sgn(x2 -1 )
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06/29/16

differentiation of a function
Prove dy/dx = sec x for y= ln tan(π/4 + x/2)
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06/26/16

Can Someone help me
Using a wheel and axle machine, a force of 100 N applied to the rim of a wheel can lift a load of 80 kg .The diameters of the wheel and axle are 1 m and 80 cm respectively. Determine the actual... more
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05/14/16

If the temperature of argon gas is 400 K and the average velocity of argon is twice that of radon what is the temperature of radon gas?
The answer key says it is 555 K. How do I approach this question? 
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04/08/16

physic - projectile
Which of the following is INCORRECT? (assume a constant take-off velocity) a. At a take-off angle of 10o and 75o, the distance traveled is similar but the time is much longer for 75o.b. At a... more
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04/03/16

Use inverse functions
2 cos^2 x +7 sin x =5
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03/28/16

How can i find b?
A 43 mg of a vaccine is given to a patient to prevent measles. The vaccine leaves the body at a rate of5.2% per hour. b-The number of milligrams of vaccine in the body after h days is how many... more
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03/28/16

Equation of circle given center and tangent line
What is the equation for a circle which has its center at (1, 2) and is tangent to the line -3x+2y= 14. Solve using your algebra skills; DO NOT USE CONSTRUCTIONS!!!!   The equation of a circle is... more
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03/20/16

A school has 690 Pupils and teachers altogether.
A school has 690 Pupils and teachers altogether. There are 3 times as many girls as boys, there are 25 more teachers than boys. How many pupils are there? How many teachers are there?
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03/20/16

A Salty Tank
A very large tank initially contains 15 gallons of saltwater containing 6 pounds of salt. Saltwater containing 1 pound of salt per gallon is pumped into the top of the tank at a rate of 2 gallons... more
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12/06/15

Series converges or diverges
∞ ∑ (2n+3)/(n2+3n+1) n=0
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11/09/15

the length of a rectangle is 3 inches less than twice the width, find the length and width if the perimeter is 45 inches
 I have to find the perimeter. 
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11/08/15

Heat Transfer
Suppose a lake has a layer of ice 12 cm thick on its surface. The top of the ice layer is cooled by the atmosphere to -5.45° C. The lower surface is in contact with water at 0.0° C. The thermal... more
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11/06/15

Calculate the freezing point and boiling point of each of the following solutions:
Calculate the freezing point and boiling point of each of the following solutions:       1)  the freezing point of the solution: 153 g of sucrose, C12H22O11 , a nonelectrolyte, dissolved in... more
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10/23/15

How many quarts of water must be added to 13 qt of an 80% antifreeze solution to make a 65% antifreeze solution?
Answer must be given in quarts.
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10/23/15

How much water must be evaporated from 17 qt of a 70% antifreeze solution to produce an 85% solution?
Answer must be given in quarts
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10/23/15

A butcher has some hamburger that is 18% fat and some that is 12% fat. How many pounds of each should be mixed to make 81 lb of hamburger that is 14% fat?
How many pounds of 18% fat and how many pounds of 12% fat? Requires two answers
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10/22/15

PROBABILITY
A bag contains 6 red balls and 6 blue balls. 5 balls are selected at random. Find the probability of selecting 5 red balls.
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10/22/15

if h(x)=cscx, find all values of x on (0,360) where f'(x) = h'(x)
if h(x)=cscx, find all values of x on (0,360) where f'(x) = h'(x)
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10/22/15

my question is linearize y=f(x)=-3x^2+2x=5 at x 0 (x zero)=-2 , thank you!
this is a calculus question from my univ hw.
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10/22/15

Calculate the change in internal energy of the following system: A balloon is cooled by removing 0.651 kJ of heat. It shrinks on cooling, and the atmosphere doe
Calculate the change in internal energy of the following system: A balloon is cooled by removing 0.651 kJ of heat. It shrinks on cooling, and the atmosphere does 386 J of work on the... more
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10/15/15

Modelling Linear Systems
It took a patrol boat 5 hours to travel 60km up a river against the current, and 3 hours for the return trip with the current. Find the speed of the boat in still water and the speed of the current.
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10/15/15

Modelling Linear Systems, using Volume, Percentage and mL
What volume, in millilitres, of 60% hydrochloric Acid sol. must be added to a 100mL of a 30% hyrdrochloric acid sol. to make a 36% hyrdrochloric acid sol.?
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10/09/15

The owner of a fourplex rented four apartments for different amounts with a mean rental of $650. One of the apartments was extensively remodeled and the owner
increased the rent of that apartment from $525 to $825. What is the new mean rental of the four apartments?
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10/07/15

A trench is being dug by a team of labourers who removes V cubic metres of soil in t minutes, where V=10*t-(t^2)/20.
V=10*t-(t2)/20   a) State the logical domain of the function, i.e. the values of t during which soil is being removed.b) At what rate is the soil is being removed at the end of 40 minutes ?c) Are... more
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