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elixir [45]
3 years ago
10

Louisa used a gift card to pay for 3 meals

Mathematics
2 answers:
olasank [31]3 years ago
6 0

Answer:

21

Step-by-step explanation:

topjm [15]3 years ago
6 0
$-21 ; (-7) (3) = -21
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Ellis is painting wooden fenceposts before putting them in his yard. They are each 5 feet tall and have a diameter of 1 foot. Th
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Answer:

39.25 cubic feet of paint will be needed by Ellis.

Step-by-step explanation:

Volume of a cylinder:

The volume of a cylinder of radius r and height h is given by:

V = \pi r^2h = 3.14r^2h

How much paint will Ellis need to paint all the surfaces of the 10 fenceposts?

This is the combined volume of these 10 fenceposts.

They are each 5 feet tall and have a diameter of 1 foot.

Radius is half the diameter, so r = \frac{1}{2} = 0.5. Also h = 5

10 fenceposts:

Each has the same volume, so:

V = 10(3.14)r^2h = 31.4(0.5)^2(5) = 39.25

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2 years ago
Factor over the complex numbers, if possible: x² + 2xyi - y2<br><br> What is the answer?
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Answer:

  (x +yi)²

Step-by-step explanation:

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Here, we have a=x and b=yi. Then the factorization is ...

  x² +2xyi +(yi)² = (x +yi)²

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Step-by-step explanation:

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