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A family is canoeing downstream (with the current). Their speed relative to the banks of the river averages 2.75 mi/h. During the return trip, they paddle upstream (against the current), averaging 1.5 mi/h relative to the riverbank.
a. Write an equation for the rate of the canoe downstream. b. Write an equation for the rate of the canoe upstream. c. Solve the system to find the family's paddling speed in still water. d. Find the speed of the current of the river.
Assume season-ticket prices in the lower bowl for the Buffalo Bills will rise from $495 for a 10-game package to $770. Fans sitting in the best seats in the upper deck will pay an increase from $310 to $555. Don Manning plans to purchase 4 season ..
A bus traveled at an average rate of 50 miles per hour then reduced its average rate to 40 miles per hour for the rest of the trip. If the 220-mile trip took 5 hours, determine how long the bus traveled at each rate.
Use the line of best fit to predict the number of mistakes for someone who goes 8 hours with no sleep. Does the result make sense? Why or Why not, explain.
If A and U are two subsets of a normed vector space, and U is open, show that A+U is open. Here A+U={a+u | a belongs to A and u belongs to U}.
Trigonometric identities to find length of the guy wire.
on friday a local hamburger shop sold a c ombined total of 426 hamburgers and cheeseburgers. The number of cheeseburgers sold was two times the number of hamburgers sold. how many hamburgers were sold on friday?
A central angle of a circle of radius 30cm intercepts an arc of 6cm the central angle in terms of degrees is? The reference angle of 3.22 rev?
sand is poured into a right circular cylinder of radius 12m along its x-axis. once sand is completely covers the bottom
Perform an appropriate test of hypothesis to determine if there is evidence, at the .05 level of significance, to support the claim that the mean bone marrow microvessel density is higher before the stem cell transplant than after the stem cell tr..
Suppose that the sample is enlarged to 14 measurements, by including two additional measurements having a common value of 27 each. Find the standard deviation of the sample of 14 measurements.
The gestation time for human babies is assumed to be normally distributed with a mean of 278 days and a standard deviation of 12 days. What happens to the standard deviation of the sampling distribution of the sample mean as n increases?
An expensive fencing along the lots length costs $20 per fott and an inexpensive fencing along the two side widths costs only $8 per foot. the total cost of the fencing along the three sides comes to $3280. What is the area of the lot?
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