04/27/15

How do I find the probability of one person''s blood pressure will be greater than 120. There is a mean of 118 and a standard deviation of 9
There is a standard deviation of 9 and a mean of 118
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04/27/15

A certain radio station broadcasts at 101.5 megahertz
A certain radio station broadcasts at 101.5 megahertz. This is the frequency of oscillation of electrons in the transmitting antenna producing the radio wave. Find the period of the electrons' motion. more
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04/25/15

scatter plotts and periodic or seasonal pattern in data
Other than a definite trend, what observation of the scatter plot might indicate a periodic or seasonal pattern in the data?
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04/24/15

The safe load, L, of a wooden beam of width w, height H, and length l, supported at both ends, varies directly as the product of the width and the square of the
The safe load, L, of a wooden beam of width w, height H, and length l, supported at both ends, varies directly as the product of the width and the square of the height, and inversely as the length.... more
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04/22/15

Finite: A fair coin is tossed 4 times with the outcomes (tails or heads) recorded each time. Define X to be the number of heads recorded. Find Pr(X=3).
I have no idea how to do this. An explanation on how you got to the answer would be really great!
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04/20/15

determine x and y
2x-4y=6 find x and y
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04/20/15

find if and how these too are perpendicular
3x-y=3 and x+3y=-12 are perpendicular 
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04/19/15

What is the derivative of the hyperbolic tangent equation?
Suppose I have the following hyperbolic tangent equation: (1-e^(-(2x)))/(1+e^(-(2x)))   What will be the derivative of this equation?
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04/17/15

When dealing with Scatter Plots and Line of Best Fit, what helps you determine where to put the line?
What method, factors???
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04/13/15

Statistics
Botanists have determined that the length of time it takes one variety of plant seed to germinate is normally distributed wit a mean of 26 days and a standard deviation of 4 days. Find the... more
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03/27/15

N^3+N^3=N^3
I can't solve this question.Please help me. I have an example of it N^2+N^2=N^2 3^2+4^2=5^2 9+16=25 25=25 both become equal.And don't use 0 Please help me.  
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03/25/15

Statistics- Sampling Distributions
   Hi! I am in a college statistics class and we have just finished covering sampling distributions. I am trying to work through my homework problems right now and am totally lost! I know the... more
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03/23/15

help with algebra!
The profits of a company are found by subtracting the company's costs from its revenue. If a company's cost can be modeled by 10x+130,000 and its revenue can be modeled by 50x-0.0004x6^2, what is... more
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03/21/15

Drawing line
Draw a line with a negative slope and negative x intercept
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03/21/15

Find the initial value problem
Can u help me solve this problem:  (cos y) dy/dx - sin(y) = x, where y(0)=0      
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03/19/15

Probability of draws without replacement. please help! I'm stuck!
An urn contains red balls and white balls. If Frank chooses balls at random from the urn, what is the probability that he will select red balls and white balls? Round your answer to decimal... more
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03/18/15

A roofer is going to drop a hammer from the roof. The roof is 25 feet high.
The function H=-16t^2+25 gives the hammer height above the ground after t seconds. How many seconds does it take for the hammer to hit the ground? I am having a lot of trouble with this question! 
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03/18/15

Given X ~ N(12,64)
I have no idea how to figure this one out. Please help! thanksx has a ____________ Distribution µ=______          s2_________          s=__________P(X > 12)  =  ______ the 50th %ile is equal to... more
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03/18/15

Chi Square
Vehicles heading west on Front Street may turn right, left, or go straight at Elm Street. The city trafficengineer believes that half of the vehicles will turn left through the intersection. Of the... more
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03/18/15

4cos^2(4x)-3=0
The value π/12 is a solution to 4cos^2(4x)-3=0.   a) true b) false    ???   Do I plug π/12 in place of x?    Can you show the steps please?  Thanks.
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03/08/15

Speed of light of a diamond
The index of refraction of diamond is 2.42. What is the speed of light in diamond? Explain how you got this answer? calculation show
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03/07/15

Find the area of the region bounded by the parabola y = 2x2, the tangent line to this parabola at (2, 8), and the x-axis.
I am having trouble overall with the topic (Find the area of shaded region) in Calc 2. I would like to have a clear understanding of how to find the answer to this problem. A step by step solution... more
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03/06/15

one number is four less than a second number five times the first is twelve more than three times the second
just need to know how to set it up 
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03/04/15

find the area to the right of z=1.43
i do not understand how to solve this problem 
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03/04/15

Correlation and regression coefficient
Hi, Does correlation coefficient decide regression coefficient? For example, if I'm trying to figure out the relationship between hours exercising and GPA between male and female students.... more
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