01/23/15

maximize P=3x+2y subject to x+y<8, 2x+y<9, x>0 y>0
< and > are greater than or equal to 
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01/22/15

discrete calc problem with spheres
A sphere is growing at a rate proportional to the radius. At t=0 the radius is 8in and at t=30 the radius is 12in. What is the radius at t=15?   I'm stumped on this one. I've worked with taking... more
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01/21/15

6^x=11, can find out x with out logarithms
can find out x with out logarithms
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01/19/15

the area that lies between Z=-0.23 and Z=0.23 is
the area that lies between Z=-0.23 and Z=0.23 is
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01/17/15

Doubling Time #2-3
Suppose that the number of cells in a tumor doubles every 5 months. Considering that the tumor begins with a single cell, answer the following: How many cells will there be after 3 years? (Check... more
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01/14/15

My daughters 3rd grade math problem
Enough snow!  All of the melting snow is causing damage to Dr. Richmond's house.  She needs to hire people to shovel off her deck.   Dr. Richmond says when the job is completed to her... more
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01/14/15

What three numbers are less that -2 but greater than -14 1/2
What three numbers are less that -2 but greater than -14 1/2?
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01/14/15

Paul has 30 postcards He has 4 times as many large postcards as small postcards. How many small postcards does he have? How many large postcards?
Paul has 30 postcards He has 4 times as many large postcards as small postcards. How many small postcards  does he have? How many large postcards?
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01/14/15

please answer
Ciara has a bag of 50 colored marbles .There are white blue and purple marbles . she empties the bag sorts the marbles and counts 18 white and 16 blue marbles . She wants to write a ratio of the... more
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01/14/15

Word Problem about electricity function
An electricity company charges its customers a base rate of $10 a month, plus 6 cents per kilowatt-hour(kWh) for the first 1200kWh and 7 cents per kWh for all usage over 1200 kWh. Express the... more
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01/12/15

how fast is the top of the ladder sliding down the wall when the bottom of the ladder is 6ft from the wall?
A ladder 10ft long rests against a vertical wall. If the bottom of the ladder slides away from the wall at a rate of 1ft/s how fast is the top of the ladder sliding down the wall when the bottom of... more
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01/10/15

probability puzzle
Assume you go to the doctor and you are tested for the dreaded XYA disease. He informed you that you tested positive. Since the the test has a false positive rate of 5% he tells you there is only a... more
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01/10/15

Select the approximate values of x that are solutions to f(x) = 0, where f(x) = -3x2 + 2x + 6.
Select the approximate values of x that are solutions to f(x) = 0, wheref(x) = -3x2 + 2x + 6.
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01/09/15

why is it important to define a variable before writing an equation?
I'm in 8th grade and can't seem to figure it out. NEED ASAP   
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01/08/15

converting units
okay if Lydis writes 4 and a half pages of her science report in one hour What was her writing rate in pages per minute 
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01/08/15

Find parametric equations for the path of a particle that moves along the circle x2 + (y - 3)2 = 16 in the manner described.
 (Enter your answer as a comma-separated list of equations. Let x and y be in terms of t.)1)once around clockwise, starting at (4,3) 0≤t≤2pi2)three times around counter clockwise, starting at... more
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01/07/15

The parametric equations x = x1 + (x2 - x1)t, y = y1 + (y2 - y1)t where 0 = t = 1 describe the line segment that joins the points P1(x1, y1)...
(problem continued)..."and P2(x2,y2). Draw the triangle with vertices A(1, 1), B(4, 3), C(1, 7). Find the parametrization, including endpoints, and sketch to check. (Enter your answers as a... more
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01/07/15

Draw the unit circle with center (0,0)and plot the point P=(6,2). Observe there are TWO lines tangent to the circle passing through the point P.
1)the tangent line on top of the circle(L1) has coordinates? a) what is the equation for L1?2) the tangent line below the circle(L2) has coordinates?b)what is the equation for L2?I have the... more
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01/05/15

What is a resonable graph of the function rule, given that the capacity ofmthe spa is 250 gal? What is the weight of the spa when empty? Explain please.
The function rule W=8g+700 represents the total weight (W), in pounds, of a spa that contains (g) gallons of water. What is a reasonable graph of the function rule, given that the capacity of the... more
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01/05/15

What should the width of the border be?
you have a rectangupar stained glass window that measures 2 feet by 1 foot. You have 4 square feet of glass with which to make a border of uniform width around the window.
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01/04/15

How to do the work for (3,-3) ;m =-15
I have the answer I just can't figure the work out. The answer is 3x+8y=-15.
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01/04/15

What is the equation of the line through( 3,3) that is perpendicular to the line y=-1/2x+2?
Is there any easy way to solving this problem?
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01/02/15

How much thrust/power will be needed?
In a situation where there was a piece of machinery that needed to be lifted off the ground with electric propulsion, the machinery is lets say 4'x6'x3' and only weighs 180 pounds,say there is fan... more
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12/30/14

A dolphin in an aquarium is 12 feet long. A scale model of the dolphin is 3.5 inches long. What is the scale factor of the model?
Can't figure out how to find the scale factor of the model. HELP!
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12/28/14

I need help, can anyone answer this?
The total profit in thousands of dollars from the sale of x thousand units of a new arthritis drug is give by the function: f(x)= -x^3+7.5x^2+72x. How many units should be sold to maximize the... more
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