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Tam bought two pairs of roller skates. The difference between the prices of the two pairs of skates was $64. The sum of the prices was $294. How much did each pair of roller skates cost?
A vat with 600 gallons of beer contains 4% alcohol (by >volume). Beer with 6% alcohol is pumped into the vat at a rate of 6 gal/min and the mixture is pumped out at the same rate. What is the percentage of alcohol after an hour?
How many cups of salt should be added to five cups of mixture A so that the resulting mixture has equal amounts of salt and pepper?
Find the volume of the solid in the first octant bounded by the surfaces of z = 1 - y^2, y = 2, and x = 3.
There are two lines through the point (2,-3) that are tangent to y=x²+x. Find the x-coordinates of the points where these lines touch the parabola.
The DNA molecule has the shape of a double helix. The radius of each helix is about 8 angstroms (1Å = 10-8 cm). Each helix rises about 33 Å during each complete turn, and there are about 2.9 108 complete turns. Estimate the length of each helix. (..
A wrench 0.6 meters long lies along the positive -axis, and grips a bolt at the origin. A force is applied in the direction of at the end of the wrench. Find the magnitude of the force in newtons needed to supply 100 newton-meters of torque to the..
Three congruent circles with radius 5 are tangent to each other. The circles are enclosed in an equilateral triangle. What it the perimeter of the triangle?
Calculate the ninety-nine percent confidence interval find the gasoline mileage of an individual, randomly selected 2006 car with 180 horsepower.
jhon, mary,and ali have 17,12 and 10 marbels respectively what is the everage of marbels each of them have?
Conditions for Linear transformation. This chapter starts as follows rotations about the origin and all reflections in lines through the origin can be expressed as functions with rules of the form
Pizza Preference Probability Problem, Short Answer. Of 23 college sophomores at Crocodile Community College, 12 preferred pepperoni pizza, 7 preferred supreme, and 4 preferred cheese
What is the standard deviation of this sampling distribution? (Round your answer to two decimal places.)
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