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ladessa [460]
3 years ago
7

Give a solution I needed it urgent

Mathematics
2 answers:
Anna35 [415]3 years ago
7 0

Answer:

A≈967.61

Step-by-step explanation:

Ymorist [56]3 years ago
7 0

A=2pie r×h + 2pie r^2

Step-by-step explanation:

2×22/7×7×15 + 2×22/7× 7^2

2×22×15 + 2×22×7

660 + 308

=968

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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.
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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 ...

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

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

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Then the value of x is

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3 years ago
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