04/22/16

f(x)=-x2-2x+8=(x+4)(2-x)
I need help answering this math question please
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04/19/16

trigonomery
Once everybody board Ferris wheel makes one complete revolution every 2.4 minutes. Wheel has diameter 150 feet clears ground 4 feet. Assume new riders board low point cycle.
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04/19/16

Find an equation of the ellipse having foci (0,-2) and (0.2) and sum of focai radii 8. Please help!
I'm so confused with what to do with the focal radii. What purpose does it serve in this problem? For this problem, i got the answer x^2/√12 + y^2/ 16 = 1. I know this answer is wrong. Can... more
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04/19/16

Solve the equation 9 cos (theta) + 4 = 0
9 cos 'theta' + 4 = 0 has two solutions, and it is in degrees (Round to the nearest hundredth).
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04/18/16

trigonometry
graph  f(θ)=1/4cot(x-pi/4) where 0 ≤ θ≤ to 2pi
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04/18/16

Please help with the question below (combinations and permutations)
A club has 30 members under the age of 30 and 40 members who are 30 or older. In how many ways can a slate of officers be chosen if the President and atleast one other officer must be at least 30... more
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04/18/16

Twice the sum of a certain number and 26 is 72
It is a word problem
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04/18/16

Values of x
Here is a question in the textbook that I don't know how to do for my test!Determine all values of x for which the tangent to f(x)=x-sin2x is horizontal.
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04/17/16

Find the best point estimate of the proportion of people who wear hearing aids if, in a random sample of 640 people, 73 people had hearing aids
Solve the proble. Round the point estimate to the nearest thousandth.
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04/15/16

N=56, x=19; 95% confidence
use the given degree of confidence and sample data to construct interval for the population proportion p.
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04/15/16

Find the critical value z a/2 that corresponds to 68% confidence level
find the indicated critical z value
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04/15/16

Simplify the complex fraction by using Method II.
2 - 1/3 (fraction) + 15/2 (fraction) _____________________________   17/2 + 6     a. 83/32 b. 55/87 c. 87/55 d. 32/83
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04/14/16

probability
A certain medical disease occurs in 5% of the population. A simple screening procedure is available and in 3 out of 10 cases where the patient has the disease it provides a positive result. If the... more
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04/14/16

Kamila plans to build a concrete block wall behind her house.
Kamila plans to build a concrete block wall behind her house. The wall will be 12 feet long, 6 feet high, and 8 inches thick. Each concrete block measures 16 inches long by 8 inches wide by 8... more
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04/14/16

find the exact coefficient of a^15 * b^25 in the binomial expansion of (3a +2b)^40. explain reasoning
find the exact coefficient of a15b25 in the binomial expansion of (3a +2b)40. explain reasoning   Please help this a practice question for my upcoming exam and I am not sure of the... more
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04/13/16

HELP FAST PLEASE
Tim and Cynthia leave Cynthia's house at the same time. Tim drives north and Cynthia drives west. Tim's average speed is 10 mph slower than Cynthia's. At the end of one hour, they are 70 miles... more
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04/13/16

The New Right, which emerged as a major force in American politics by 1980, called for all of the following except
online history class
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04/13/16

A circular garden has a diameter of 12m. By how much should the diameter be increased to triple the area of the garden?
Solve with an equation. Provide a variable for each unknown.
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04/13/16

A pigpen is marked off so that its width is one half of its length. If 4m are subtracted from the length and 24 m added to the width, the pigpen would be square
Find the dimensions of the pigpen. Solve with an equation. Provide a variable for each unknown.
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04/12/16

Really need help with these 2 questions
A football kicker tries to make a field goal with the ball on the 25 yard line (105 ft from the goal posts). If you imagine a coordinate system with q ball being kicked at x=0 and the goal post at... more
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04/12/16

Find the vertices and foci of the ellipse x^2+2y^2+2x-20y+43=0
Find the vertices and foci of the ellipse x2+2y2+2x-20y+43=0
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04/12/16

StatisticsQuestion The temperature in a region during the summer time is uniformly distributed between 70°F and 100°F.
What is the probability that the temperature during summer is a) above 70°F? (b). between 70°Fand 90°F?(c). below 85°F?(d ). What is the average temperature during summer ? (e). What is the average... more
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04/12/16

Rate/Time math
It takes Mandy 11 hours to proof a chapter of Hawkes Learning Systems' College Algebra book and it takes Bethany 2 hours. How long would it take them working to
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04/12/16

If JM = 4 & JK = 9, find LK
I need help with solving this question as well as the first one! 
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04/12/16

Verify the identities in the equation:
 sinX(cscX+sinXsec2X)=sec2X
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