subject
Mathematics, 16.06.2020 18:57 sarah192002

A heavy rope must be pulled onto the roof of a tall building. Each foot of rope weighs 3 pounds, and the rope is 20 feet long. At the start of the job, moving the rope by pulling it up requires 60 pounds of force. In the middle of the job, 10 feet of the rope is resting on the roof, and only 10 feet of rope must be lifted. Now, 30 pounds of force is required to move the second half of the rope by pulling it up. The force needed to pull the whole rope onto the roof is a variable force. Which equation r( x ) could describe the variable force needed to move the rope by pulling it up? The variable x represents the feet of rope that have already been lifted on to the roof.
Note, r (x) also describes the weight of the portion of rope that must still be lifted, when x feet of rope have already been lifted on to the roof.
a. r(x) = 3x
b. r(x) = 20x
c. r(x) = 3 (20 – x)

ansver
Answers: 2

Another question on Mathematics

question
Mathematics, 21.06.2019 22:00
Amountain climber starts a climb at an elevation of 453 feet above sea level at his first rest stop he has climbed 162 feet and by his second rest stop he has climbed another 207 feet its getting late in the day so the climber starts his way down if the climber desends 285 feet how much does he need to ascend or descend to return to the original starting point
Answers: 1
question
Mathematics, 21.06.2019 22:30
Tommy buys a sweater that is on sale for 40% off the original price. the expression p -0.4p can be used to find the sale price of the sweater, where p is the original price of the sweater. if the original price of the sweater is 50, what is the sale price?
Answers: 1
question
Mathematics, 22.06.2019 02:30
Grading scale 1 has the following weights- (tests- 50% quiz- 25% homework- 15% final exam- 10%). calculate your final average if your performance in the class is as follows-test grades- {88, 84, 90, 75, 70, 81); quiz grades- {88, 67, 90, 90, 45, 99, 76, 98, 100}; homework- 90; final exam- 75
Answers: 1
question
Mathematics, 22.06.2019 04:00
Iwill mark ad braniless pls just evens
Answers: 2
You know the right answer?
A heavy rope must be pulled onto the roof of a tall building. Each foot of rope weighs 3 pounds, and...
Questions
question
Mathematics, 02.06.2021 09:50
question
Mathematics, 02.06.2021 09:50
question
English, 02.06.2021 09:50
question
Mathematics, 02.06.2021 09:50
Questions on the website: 13722367