08/23/15

The sum of the reciprocal of a number and the reciprocal of 5 less than the number is 7 times the reciprocal of the original number. Find the original number.
This is a math problem that has been giving me trouble for over 30 minutes now. I'm not quite sure how to tackle it.
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08/23/15

Elements and sets
A. List the elements of each of the following (roster method). Use '...' notation for infinite setsB = {x : x is an integer -3 < x < 4}B = {x : x is a positive integer and multiple of three}B... more
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08/23/15

Could you help me with an algebra question?
To help sell more of a lower grade meat, a butcher mixes some premium ground beef worth $3.10/lb with 8lb of lower grade ground bee worth $2.05/lb. If the result was an intermediate grade of ground... more
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08/22/15

center of mass
Particles A and B are located on the x-axis. The masses and positions of the particles are:            mA = 12 grams            xA = 2             mB= 8 grams              xB = 10            What... more
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08/22/15

Suppose that a slice of pizza at a temperature of 80°F has been placed inside a freezer, where the temperature is 2°F.
I know that the equation, dT(t)/td = k(T(t)-2º) would represent the rate at which the temperature, T is decreasing.       If the pizza cools to 45° in 1 hour, then its temperature after t hours... more
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08/22/15

newtons law of cooling
A cup of coffee at 160° is placed in a room where the temperature is 70°. After 5 minutes, the coffee’s temperature is 112.5°.   Find the temperature of the coffee 10 minutes after it was placed... more
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08/22/15

Proove that
10! ≡ -1(mod11)
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08/22/15

How long will it take..
A certain isotope has a half-life of 5.25 days. How long will it take for 30% of the sample to disintegrate?    Solutions are appreciated. Please answer. Arigatou sensei. 
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08/21/15

Distance Problems
When he runs against the wind, Ricky can run 16 km in 2 h. With the wind, he can run 5/4 of this distance in 2h. Find Ricky's running rate and the rate of the win. Assume that both are constant.
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08/21/15

Need Summer Work Help (ASAP)!!
Literal Equations:   Solve for X. 3x+1/4y=z Solve for x1.  m=y2-y1/x2-x1
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08/20/15

a particle moves along the x-axis with its x coordinate given by the function s(t)=2t^3-21t^2+60t for t=0
what would be the speed when t=3 and how do you find the exact time the particle changes direction?
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08/20/15

Word problem
Julio is paid 1.4 times his normal hourly rate for each hour he works over 30 in a week. Last week he worked 35 hours and earned $436.60. Write and solve an equation, to find Julio's normal hourly... more
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08/20/15

helppp!!!!
What are ways discontinuous points can be accounted for graphically
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08/20/15

How can I solve this using equations?
A gym owner has some indigo weights and some green weights. The indigo weights are 9 kilograms each, and the green weights are 2 kilograms each. The owner has 9 weights, and they weigh 32 kilograms... more
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08/19/15

What is the slope of a line that is parallel to a line with a slope of 1/2?
I don't get this question.
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08/19/15

algebra 2 problem
I’m attempting to find the quotient and remainder and have no idea what to do   6x^3-5x^2+x+1divided by x+2
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08/19/15

I have two questions and if can show the work that would be great for both
Calculate the sum for each of the following inifinite geometric series that converge    1) -16/81 + -8/27 + -4/9 + -2/3 +...   2) √10/4 + 10/16 + 10√10/(64) + 100/256 +...   
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08/19/15

characteristics of functions
given the functions f(x)x+2 and g(x)= x2 determine all values of x for which f(g(x))=g(f(x))
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08/19/15

multiple choice
determine the average rate of change of the function y=sin(x) from x=0 to x= pi/2a)0b)pi/2c)1d)2/pi
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08/18/15

What coordinate will both people walk through
Gina and Marissa each walk in a straight line between two points. Using the points on a map that the girls created, Gina will start at (–6, –10) and will stop at (3, –1). Marissa will start at (4,... more
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08/18/15

Trig question i dont understand
Give all radian solutions to cos7xcos2x+sin7xsin2x=1/2. How do I do this?
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08/18/15

need help with a confusing trig question.
Write an expression equivalent to csc((2cot^-1)x), yet that does not use trigonometric functions. Assume the variable represents a positive value.
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08/18/15

Equation to find the amount left after t years
Suppose that a sample initially contains N0 grams of a radioactive substance. If this substance has a half-life of 32 years, then which of the following equations can be used to find the amount... more
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08/18/15

Which of these differential equations is NOT seperable?
dy/dy=x+y   dy/dy=xy   dy/dy=x/y   dy/dy=2xy
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08/18/15

sine and cosine
sec x=sin2x/sinx - cos2x/cosx
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