03/03/15

Please help me solve this half-life word problem
The half-life of a radioactive substance is 2,500 years. If 20 grams are present now, how much will be present in 50 years? (Round your answer to two decimal places.)
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03/03/15

how many 5 digit numbers can you make by having 1 three and 2 fours
Looks to be a complicated permutation and combination question
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03/03/15

Probability
Four balls are selected at random without replacement from an urn containing three white balls and five blue balls. Find the probability of the given event. (Round your answer to three decimal... more
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03/02/15

Finite Homework: Probability and statistics.
1. Assume that there are 19 frozen dinners: 10 pasta, 6 chicken, and 3 seafood dinners. The student selects 5 of them. What is the probability that at least 2 of the dinners selected are pasta... more
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02/25/15

A cylinder of lead has a mass of 14 kg. If the cylinder is 3 cm in diameter, calculate its height.
Can you please help me?
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02/25/15

|-13|-|13|=-13-13=-26
Describe and correct error
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02/25/15

Chi Square
At a school pep rally, a group of sophomore students organized a free raffle for prizes. They claim that they put the names of all of the students in the school in the basket and that they randomly... more
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02/20/15

Josie wants to buy internet access
One service provider charges a flat rate of $34.95/month. A second charges $25/month plus 33¢/hour. For what number of hours per month should Josie choose the flat rate?
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02/16/15

if four teachers are sampled find the missing value p(x)=.24, .14, ?, .33
how do I do this? Is there enough information given?
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02/14/15

integrate sechsqrt(x) tanhsqrt(x)/sqrt(x)
I'm not quite sure on how I should approach this.
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02/13/15

I don't know what this number means or how to enter it into my calculator
I have T 1 84 plus, and don't know how to enter this problem into my calculator.  3.138159506 E 15/1 E 20. Can anyone tell me how to enter that into my calculator and also what it means. I don't... more
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02/13/15

What length 3/4 v-belt is needed
an electric motor is used to run am auger. The motor is turning at 3700 rpm. It is installed with a 3.5 inch pulley that uses a 3/4 inch v-belt. The auger should turn at 800 rpm. The centers of the... more
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02/10/15

I need help with this
8(2x+9)=56
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02/09/15

find the limit
lim       (8)/(xcot5x)=? x→0  
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02/08/15

The wind farms in souther Cali
The wind farms in southern California contain generators whose power production varies directly with the cube of the wind's speed. If one generator produces 1000W (1kW) of power with a 25 mph wind,... more
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02/08/15

A spherical tank has a capacity of 700 gallons. Using one gallon is about 0.1337 ft^3. Find the radius of the tank.
A spherical tank has a capacity of 700 gallons. Using one gallon is about 0.1337 ft^3. Find the radius of the tank.
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02/02/15

write an equation that expresses the relationship. Then solve the equation for m.v varies jointly as m and the square of a.
Very hard, couldn't come up with answer. There's no numbers involved, just letters.
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02/02/15

What is the slope of the line passing through the points (0, 4) and (-8, -1)?
im confused how to do this
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02/01/15

The mean of the commute time to work for a resident of a certain city is 27.3 minutes. Assume that the standard deviation of the commute time is 6.6 minutes.
What minimum percentage of commute in the city has a commute time within 2 standard deviations of mean????  
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01/27/15

how do i factor s^2+4st-12t^2
s2+4st-12t2
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01/26/15

If a - b = 17.5 and a + b = 10 what is the value of {a^2} - {b^2}
I don't know where to start
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01/26/15

if a^2+b^2=4 and (a-b)^2=2, what is ab?
I don't know where to start
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01/26/15

Bob has $7565 in his savings account that earns 3.5% intrest compounded continuously. what is the total amount in his account after 3 years?
I need work plz this is for a quiz  
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01/25/15

A block of mass M is placed on a surface of table and is pulled by a force F acting at an angle F with horizontal . Find acceleration of block if coefficient of
A block of mass M is placed on a surface of table and is pulled by a force F acting at an angle Φ with horizontal . Find acceleration of block if coefficient of friction between surface and block... more
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01/23/15

can anyone help and give an example
Describe how you know if an inequality is an “and” or an “or” problem. (use -3 < x+5 < 8). Also, how do you know if an absolute value question is an “and” or an “or” problem? Lastly, will you... more
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