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dexar [7]
3 years ago
5

A biologist studied the populations of white-sided jackrabbits and black-tailed jackrabbits over a 5-year

Mathematics
1 answer:
natita [175]3 years ago
8 0
The correct answer is B
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Josephine can correct her students' test papers in 9 hours, but if her teacher's assistant helps, it would take them 7 hours. Ho
kirill [66]

Using the together rate, it is found that it would take the assistant 31 hours and 30 minutes to do it alone.

<h3>What is the together rate?</h3>

It is the sum of each separate rate.

In this problem, the rates are given as follows:

  • Josephine: 1/9.
  • Assistant: 1/x.
  • Together: 1/7.

Hence:

\frac{1}{9} + \frac{1}{x} = \frac{1}{7}

\frac{x + 9}{9x} = \frac{1}{7}

9x = 7x + 63

2x = 63

x = 31.5.

It would take the assistant 31 hours and 30 minutes to do it alone.

More can be learned about the together rate at brainly.com/question/25159431

7 0
1 year ago
For lunch, Ruby orders the items shown below Ham and cheese sandwich $4.95
nika2105 [10]

Answer: 9.38

Step-by-step explanation:

I added them all up and then found what 11 percent of all of that was. Rounded it up and added it to the total.

6 0
3 years ago
Kayla got 18 out of 20 questions correct on a science test what percentage of the questions did kayla get correct
Ksju [112]

18/20=0.9

Move decimal two spaces to the right and include percent sign

90%

7 0
2 years ago
Read 2 more answers
One month Abdul rented 3 movies and 5 video games for a total of . The next month he rented 6 movies and 2 video games for a tot
MrMuchimi

Answer:

Video Games = $5.25

Movies = $1.25

Step-by-step explanation:

(3x + 5y = 30)2

6x + 2y = 18

                                           Video Games (y) = 5.25

  6x + 10y = 60

<u>-  6x + 2y = 18   </u>

      (8y)/8 = (42)/8

<u>                                                                                </u>

6x + 2(5.25) = 18

6x + 10.5 = 18

6x = 7.5

x = 1.25

Double Check by plugging in the numbers

7 0
3 years ago
Helpppppppp meeeeeeeeeeee
sertanlavr [38]
A and E.

x= (1+ root-71)/6 and x= (1-root-71)/6
3 0
3 years ago
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