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Diano4ka-milaya [45]
2 years ago
10

Explain how an estimate helps you place the decimal point when multiplying 3.9 × 5.3

Mathematics
2 answers:
natali 33 [55]2 years ago
4 0
An estimate helps you because you round 3.9 to 4 and 5.3 to 5 so then you can give a rough estimation
den301095 [7]2 years ago
4 0

Answer:

3.9\times 5.3\approx 20

Step-by-step explanation:

To find : How an estimate helps you place the decimal point when multiplying 3.9\times 5.3 ?

Solution :

Estimate the number 3.9 by rounding to ones,

As tenth place 9 >5 ones place round by 1.

So, 3.9\approx 4

Estimate the number 5.3 by rounding to ones,

As tenth place 3<5 ones place remain same.

So, 5.3\approx 5

3.9\times 5.3\approx 4\times 5

3.9\times 5.3\approx 20

Therefore, 3.9\times 5.3\approx 20

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3 years ago
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Kathi and Robert Hawn had a pottery stand at the annual Skippack Craft Fair. They sold some of their pottery at the original pri
grigory [225]

Answer:27 pieces were sold at the original price.

63 pieces were sold at the new price

Step-by-step explanation:

Let x represent the number of pieces of pottery that was sold at the original price.

Let y represent the number of pieces of pottery that was sold at the new price.

They sold some of their pottery at the original price of​ $9.50 for each​ piece. This means that the amount that they got from selling x pieces of pottery at the original price would be 9.5x

They later decreased the price of each piece by​ $2. This means that the new price was 9.5 - 2 = $7.5

This means that the amount that they got from selling x pieces of pottery at the new price would be 7.5y

If they sold all 90 pieces and took in ​$729​, then the equations are

x + y = 90

9.5x + 7.5y = 729 - - - - - - - - - -1

Substituting x = 90 - y into equation 1, it becomes

9.5(90 - y) + 7.5y = 729

855 - 9.5y + 7.5y = 729

- 9.5y + 7.5y = 729 - 855

- 2y = - 126

y = - 126/- 2 = 63

Substituting y = 63 into x = 90 - y, it becomes

x = 90 - 63 = 27

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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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Which expression is equivalent to 5x + 5y + 5y?
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Answer:

5x + 10y

Step-by-step explanation:

5x + 5y + 5y = 5x + 10y

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