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nexus9112 [7]
3 years ago
12

Original 42.54 marked down 30% what is the new price

Mathematics
1 answer:
TiliK225 [7]3 years ago
3 0

Answer:

$29.78

Step-by-step explanation:

30% is written as 0.3 in decimal form.

<u>Find the amount taken off:</u>

$42.54 · 0.3 ≈ $12.76

<u>Then, subtract the original price by the amount taken off</u>

$42.54 - $12.76 = $29.78

<u>Conclusion:</u>

The new price is $29.78

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Please note that pi has just one value.  The only difference stems from round-off error when you don't use all of the digits following "3.14159 ... " to represent the value of pi.  The formula for circumference is C = 2 pi r, or C = pi d, 
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Circle A:  Diameter 9 inches and Circumference of 28.26 inches

If the diameter is 9 inches, then C = 28.26 inches = pi (9 inches).  Divide 28.26 inches by 9 inches.  Note that you MUST round off the ratio (pi) that you obtain, since 28.26 has 4 significant figures and 9 has just one.

28.26
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5 0
3 years ago
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If DF = 170, find the value of x. Then find DE and EF.<br> DE=3x + 20<br> EF=2x + 40
Julli [10]

9514 1404 393

Answer:

  DE = 86

  EF = 84

Step-by-step explanation:

We assume that point E lies on segment DF, so that ...

  DE + EF = DF

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  5x = 110 . . . . . . . . . . . . . . . collect terms, subtract 60

  x = 22 . . . . . . . . . . . . divide by 5

  DE = 3×22 +20 = 66 +20 = 86

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7 0
3 years ago
What is the weight of a square if a triangle weighs 4 grams? Explain your reasoning
stellarik [79]

Answer:

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Step-by-step explanation:

The balance is in equilibrium, so the weights of the two sides are equal.

Let the weight of a square be s.

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