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a student averages 84 on five tests. If the student received grades of 84, 82, 81 and 79 on the first four exams, what grade did the student receive on the fifth exam?
151 g of water at 79.0°C are mixed with 75.2 g of water at 23.0°C. If no heat is lost to the surroundings, what is the final temperature of the water? The specific heat of water is 4.184 J/g·°C.
A man rows a boat 480 feet upstream against a constant current in 8 minutes. He then rows 210 feet downstream ( with the same current) in 3 minutes. Find the speed of the current and the equivalent rate at which he can row in still water.
How many permutations are there of 12 objects taken five at a time? How is this answer related to answers in 1 and 2?
How many students does the college need to enroll in the first year to break even?
barney was charged $99 for 3 days and 300 miles, while mary was charged $175 for 5 days and 600 miles. what does best rental charge per day per mile?
To pour a concrete sidewalk takes 2 hours of preparation nd 3 hours of finishing. To pour a concrete patio takes 4 hours of preparation and 3 hours of finishing. ABC Concrete Company makes a profit of $450 on a sidewalks and $700 on a patio.
the function w(d)=0.112d approximates the amount, in centimeter,s, of water that results from d cm of snow melting. Find the amount of water that results from snow melting from depthsof 10cm, 38cm, and 57cm.
a bowl is shaped like a hemisphere with diameter 30 sm. A ball with diameter 10 cm is placed in the bowl and water is poured into the bowl to a depth of h centimeters. Find the volume of water in the bowl.
a field is in the shape of a trapezoid. the altitude of the trapezoid is 120 feet and the bases of the trapezoid are 180 feet and 200 feet. what is the are of the field?
Fred invests $3000 more in an account that pays 4% simple interest than he invests in an account that pays 3% simple interest. If the total interest earned for the first year is $610, how much did Fred invest in each account?
Use the Gauss-Jordan Method of Computing Inverses to find the inverse and then to solve the system of linear equations.
Suppose the monthly total cost for the manufacture of radio is C(x)=1475 + 45x, where x is the number of radios produced each month. What is the marginal cost for the product?
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