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dybincka [34]
3 years ago
6

I need help with this please

Mathematics
1 answer:
mezya [45]3 years ago
4 0

Answer:

answer is b

Step-by-step explanation:

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Alexa pays 7/20 of a dollar for each minute she uses her pay-as-you-go phone for a call, and 2/5 of a dollar for each minute of
9966 [12]

Answer:

  • The system of equations is x + y = 85 and 7/20x+2/5y=31
  • To eliminate the x-variable from the equations, you can multiply the equation with the fractions by 20 and multiply the other equation by -7.
  • B-She used 60 minutes for calling and 25 minutes for data.

Step-by-step explanation:

It is always a good idea to start by defining variables in such a problem. Here, we can let x represent the number of calling minutes, and y represent the number of data minutes. The the total number of minutes used is ...

  x + y = 85

The total of charges is the sum of the products of charge per minute and minutes used:

  7/20x + 2/5y = 31.00

We can eliminate the x-variable in these equations by multiplying the first by -7 and the second by 20, then adding the result.

  -7(x +y) +20(7/20x +2/5y) = -7(85) +20(31)

  -7x -7y +7x +8y = -595 +620 . . . . eliminate parentheses

  y = 25 . . . . . . . . simplify

Then the value of x is

  x = 85 -y = 85 -25

  x = 60

7 0
3 years ago
Read 2 more answers
Select the best possible first step to solving the system by first eliminating the x variable. 3x − 9y = 6 2x − 11y = 6
Klio2033 [76]
The first step would be to add 3x and 2x i believe but I am not sure 
5 0
3 years ago
Arrange from least to greatest 3,-3, 1, -5, 0, -2, -1, 4, 6.
Darina [25.2K]

Answer:

Step-by-step explanation:

-5,-3,-2,-1,0,1,3,4,6

8 0
3 years ago
7hr= how many minutes ​
denis-greek [22]

Answer:

420 minutes

Step-by-step explanation:

1 hour = 60 minutes

7 * 1 hour = 7 * 60 minutes

7 hours = 420 minutes

5 0
2 years ago
Read 2 more answers
For the right triangle with side of lengths 5 12 and 13, find the length of the radius of the inscribed circle
I am Lyosha [343]
Hi,
r*(5+12+13)=5*12\\\\

r= \dfrac{60}{30} \\

\boxed{r=2}
3 0
3 years ago
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