How many years needed for given amount of isotope to decay
The certain radio isotope has the half life of 1650 years. How many years would be needed for the given amount of isotope to decay to 65% of that amount?
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If wheels (comprising tire) of truck are 15 inches in radius, then how many revolutions will wheel make in hour if truck travels at steady speed of 50 miles per hour? Determine to nearest 10 revolutions per hour.
RRR discovers that demand for its rubies is presently 20 rubies per week and is decreasing at the rate of one ruby per week. How fast is price changing?
The rectangular piece of cardboard, whose area is 216 square centimeters, is made into the cylindrical tube by joining together 2 sides of rectangle.
Suppose that is costs Microsoft approximately c(x) = 62500 + 550x + 0.01x^2 dollars to produce x Xbox 360s in a day. How many x boxes must be produced to minimize average cost?
The radio transmission tower is 200ft high. How long must the guy wire be attached to tower 15ft from top and is to make the angle of 29 degrees with gound.
Grade resistanceis F=Wsin theta, where theta is grade an W is weight of automobile. Determine the grade resistance of the 1600 pound car traveling on the 1.3 degree uphill grade?
Assume he can row at the rate of 3 mi/hr and can walk at the rate of 5 mi/hr. If T is total time required to reach house, state T as the function of x.
Author is paid royalties of 10% on first 10,000 copies sold, 12.5% on next 5000 copies, and 17% on any additional copies. Determine the piecewise-defined function R which specifies total royalties if x copies are sold.
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