Question 232872: 1.Solve using the five-step problem-solving process. Show all steps necessary to arrive at your solution. Express the answer in scientific notation to two decimals places unless requested otherwise.
If the distance from the earth to the sun were 92,900,000 miles, how long would it take a rocket, traveling at 2.8 × 103 miles per hour, to reach the sun? (Round to three places)
2.A semicircular window of radius 10 inches is to be laminated with a sunblock coating that costs $0.85 per square inch to apply. What is the total cost of coating the window, to the nearest cent? (Use п = 3.14. Hint: Area of Circle: A = пr2)
3.A square light-switch plate is made which measures 6 inches on each side. A square hole measuring 1 inch on each side is left in the center. If the cost to construct the plate is $3.50 per square inch, what is the construction cost? (Hint: Use A = s2)
4.A cylindrical drum has a diameter of 3 feet and a volume of 45 cubic feet. What is the height of the drum? (Hint: Use V = пr2h)
Answer by rfer(16322)   (Show Source):
You can put this solution on YOUR website! 2)
A=(pir^2)/2
A=3.14*10^2/2
A=157 sq in
3)
A=s^2-1^2
A=6^2-1^2
A=36-1
A=35
35*3.5=$122.50
4)
V=pir^2h
h=V/pir^2
h=45/3.14*1.5^2
h=45/7.065
h=6.37 ft
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