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klio [65]
2 years ago
13

The radius of a circle is increased by 3 in., which increases the area by 100 in. Find the radius of the original circle. Round

to the nearest hundredth.
Mathematics
1 answer:
Licemer1 [7]2 years ago
6 0

Answer:

3.81 inches

Step-by-step explanation:

πr² + 100 = π(r+3)²

divide by π and simplify:

r² + (100/π) = r² + 6r + 9

100/π = r² + 6r + 9

31.8309886184 - 9 = r² +6r

r² = 6r - 22.8309886184

0 = 6r - 22.8309886184

22.8309886184 = 6r

divide by 6:

3.80516476973 ≈ 3.81 inches

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Answer:

4 miles.

Step-by-step explanation:

We know that Molly travels 20 miles in 5 hours, so we can divide by 5 to find out how many miles she travels in 1.

20/5 = 4/1

Therefore, Molly travels 4 miles per hour.

7 0
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Mark it as Brainlist answer. Follow me.

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3 years ago
What is the equation of the line that passes through the point
snow_lady [41]

Answer:

3x-2y=2

Step-by-step explanation:

The equation of line having slope \frac{3}{2} and passing through (-4,-7).

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8 0
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Drag numbers to the table so it shows a proportional relationship between x and y.
dezoksy [38]

Answer:

7.5         30

45         180

Step-by-step explanation:

The given line has x = 1.25 and y = 5.

y/x = 5/1.25 = 4

x is multiplied by 4 to get y since 1.25 * 4 = 5.

That means the equation is

y = 4x

For a proportional function, every value of x must be multiplied by 4 to get y.

x = 7.5

y = 4x = 4(7.5) = 30

7.5          30

We need to find the values for the last line.

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13.75 * 4 = 55

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17.5 * 4 = 70

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30 * 4 = 120

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45 * 4 = 180

There is a 180.

45         180

Answer:

7.5         30

45         180

8 0
2 years ago
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