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2 years ago

I need need help fast (4a-7b+5+)

Mathematics

1 answer:

Nina [5.8K]2 years ago

5 0

Answer: 9

Step-by-step explanation:

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The diameter of a circle is 16 kilometers. Find the area of the circle.

Elden [556K]

The diameter of a circle is 16 kilometers. Then the area of the circle is $201.062 \mathrm{km}^{2}$

<u>Solution:</u>

Given that , the diameter of a circle is 16 kilometers

We have to find the area of the circle .

Radius is half of diameter.

$\begin{array}{l}{\text { diameter }=2 \times \text { radius } \rightarrow \text { radius }=\frac{\text {diameter}}{2}} \\\\ {\rightarrow \text { radius }=\frac{16}{2} \rightarrow \text { radius }=8 \text { kilometers. }}\end{array}$

<em><u>The area of circle is given as:</u></em>

$\begin{array}{l}{\text { area of a circle }=\pi \times r^2 \\ {\text { Area of a circle }=\pi \times 8^{2}=\pi \times 64=64 \times 3.14=201.062}\end{array}$

Hence, the area of the circle is 201.062 $km^2$

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3 years ago

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour after the time that she first checked

kakasveta [241]

Answer:A not b or c or d A!!

Step-by-step explanation:

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2 years ago

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If the temperature changed at a rate of -3 per hour,then after how many hours did the temperature reach -12

Oxana [17]

Answer:

If temperature is 0 then it takes 4 hours since 3 x 4 = 12 and 0 - 12 = -12

Whatever the temperature divide by three to get to 0 then add four to the quotient

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2 years ago

Lionel's front yard is in the shape of a square and has an area of 225 square meters

photoshop1234 [79]

One side of the square is 15 cause 15 times 15=225

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2 years ago

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Holli's house is located at (−1, 4). She can walk in a straight line to get to Jedd's house. A fast food restaurant is located a

mojhsa [17]

<h2>Answer:</h2>

The coordinate of Jedd's house is:

(-7,-2)

<h2>Step-by-step explanation:</h2>

We know that if a Point P(a,b) partitions the line joining the point (x,y) and (x',y') in the ratio m:n

Then the coordinates of the point P is given by:

$a=\dfrac{mx'+nx}{m+n},\ b=\dfrac{my'+ny}{m+n}$

Here m:n=1:2

and (a,b)=(-3,2) i.e. location of the food restaurant.

and

(x,y)=(-1,4) i.e. location of Holli's house.

and (x',y') is the location of Jedd's house.

Hence, we have:

$-3=\dfrac{1\times x'+2\times (-1)}{1+2}\ and\ 2=\dfrac{1\times y'+2\times 4}{1+2}\\\\i.e.\\\\-3=\dfrac{x'-2}{3}\ and\ 2=\dfrac{y'+8}{3}\\\\i.e.\\\\-3\times 3=x'-2\ and\ 2\times 3=y'+8\\\\i.e.\\\\-9=x'-2\ and\ 6=y'+8\\\\i.e.\\\\x'=-9+2\ and\ y'=6-8\\\\i.e.\\\\x'=-7\ and\ y'=-2$

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2 years ago

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