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puteri [66]
3 years ago
14

Person 1 can do a certain job in twenty-one minutes, and person 2 can do the same job in twenty-eight minutes. When completing t

he job together, which expression would be used to represent the amount of work done by person 1?
a. 21
b. 1/21
c. x/21
d. 21x
Mathematics
1 answer:
eimsori [14]3 years ago
7 0

The <em>correct answer</em> is:


C) x/21


Explanation:


Since Person 1 can complete the entire job (100% = 1/1 = 1) in 21 minutes, this person can complete 1/21 of the job per minute. This is Person 1's rate. If x is the amount of time it takes both people together to finish the job, then the amount of work Person 1 does would be (1/21)(x) = x/21.

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The length of a rectangle is 4ft less than its width.The area of the rectangle is 6oft<img src="https://tex.z-dn.net/?f=%5E%7B2%
Alexeev081 [22]

Answer:

Width is 10ft and length is 6ft.

Step-by-step explanation:

The area of a shape is the amount inside a shape. It is found using multiplication or A = l*w. Since the width is w and the length is 4ft less than its width or w - 4, use these expressions in the area formula to find their amount.

A = l*w\\60 = w(w -4)\\60 = w^2-4w

Subtract 60 from both sides and factor the quadratic to solve for w.

w^2 -4w - 60 = 0\\(w-10)(w+6) = 0

Set each factor equal to 0 and solve.

w - 10 = 0 so w = 10

w + 6 = 0 so w = -6.

Since w represents a length or distance it cannot be negative, this means the width is 10. The length which is w - 4ft is 10 -4 = 6. The length is 6 ft.

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3 years ago
At the airport, the car rental store charges a $25.00 initial rental fee and $30.00 an hour to use the car. What is the total co
Assoli18 [71]
30.00x3=90.00$+25.00$=115.00$ so it has to be 115.00)
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adell [148]
Yes because 2/9 is equal to 12/56 so if you do 2/9 times 6/6 you would get 12/56. YUR WELCOME NO PROBS
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The ratio of SAMs age to hank is 5 to 3. If the sum of their age is 24. How old is is hank?
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Lets consider SAM's age is 'x'  and Hank's age is 'y'
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What number can be added to 1.38 to get zero?
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-1.38. Say thank you, UR WELCome
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