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kkurt [141]
2 years ago
12

The radius of a circular rug is 4 feet. How much ribbing will you need to buy to go around the rug? Use 3.14 for π.

Mathematics
2 answers:
marishachu [46]2 years ago
8 0
P= π•d
p=3.14(8)
p=25.13
the answer is b
Alisiya [41]2 years ago
4 0

Answer:

it is b

Step-by-step explanation:

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iogann1982 [59]
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The sum of two numbers is 80. The larger number is four more than three times the smaller number. Find both numbers.
nexus9112 [7]

Let the smaller number = X

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The sum of both numbers = 80

so you have X + 3X+4 = 80

Simplify the left side:

4x+4 = 80

Subtract 4 from each side:

4x = 76

Divide both sides by 4:

X = 76/4

X = 19

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3 0
2 years ago
What proportion of these candy bars have more than 300 calories per serving? (Round your answer to two decimal places.)
Hatshy [7]

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Step-by-step explanation:

There are 65 candy bars. Out of that;

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1 candy bar has 450 to 500 calories

The total proportion out of 65 candy bars that have over 300 calories is;

= ( 2 + 1 + 4 + 1) / 65

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2 years ago
Rate at which risk of down syndrome is changing is approximated by function r(x) = 0.004641x2 − 0.3012x + 4.9 (20 ≤ x ≤ 45) wher
romanna [79]
The rate of change of the risk of down syndrome (in percentage of births per year) is
r(x) = 0.004641x² - 0.3012x + 4.9,   20≤ x ≤ 45
where
x = maternal age at delivery.

The function giving risk as a percentage of births when maternal age is x is the integral of r(x). That is,
f(x) = 0.001547x³ - 0.1506x² +4.9x + c

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0.001547(30³) - 0.1506(30²) + 4.9(30) + c = 0.14 
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c = -53.089

Answer:
f(x) = 0.001547x³ - 0.1506x² + 4.9x - 53.089,   20 ≤ x ≤ 45

The function is graphed as shown below.

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A designer is adding a border around the edge of a rectangular swimming pool. He measures the pool and finds that the length of
valentinak56 [21]
The answer is 156 meters
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