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Fittoniya [83]
2 years ago
13

The area of a circle is 39.62cm2. Find the length of the radius rounded to 2 DP.

Mathematics
1 answer:
Shkiper50 [21]2 years ago
4 0

Using the formula for area of a circle:

Area = pi x radius^2

Replace area with the given value:

39.62 = pi x radius^2

Divide both sides by pi

Radius^2 = 39.62/pi

Radius^2 = 12.62

Solve for radius by taking the square root of both sides

Radius = sqrt(12.62)

Radius = 3.55 cm

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3 years ago
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yaroslaw [1]

The solutions to f(x) = 64 is x = 7 and x = –7.

Solution:

Given data:

$f(x)=x^{2}+15 – – – – (1)

f(x)=64 – – – – (2)

To find the solutions to f(x) = 64.

Equate equation (1) and (2), we get

x^2+15=64

Subtract 15 from both sides of the equation.

x^2+15-15=64-15

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The solutions to f(x) = 64 is x = 7 and x = –7.

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3 years ago
In 1980 (before the era of in-vitro fertilization), there were 3,612,258 births in the United States (according to the U.S. Cens
scoray [572]

Answer:

There was a 1.93% probability of having multiples (twins or more) in 1980.

Step-by-step explanation:

There were 3,612,258 births in the US in 1980.

Of those,

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So

What was the probability of having multiples (twins or more) in 1980?

P = \frac{69676}{3612258} = 0.0193

There was a 1.93% probability of having multiples (twins or more) in 1980.

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coldgirl [10]

Answer:

D

Step-by-step explanation:

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First, find the reciprocal of the second number: 1/3

To find the reciprocal, flip the numerator (top number) and denominator (bottom number)

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Multiply across the numerators and denominators

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Five years ago Kate was 5 times as old as her son. In 5 years her age will be 8 less than three times her son’s age at that time
torisob [31]

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5xS

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