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OLga [1]
2 years ago
7

The average amount of ozone in several cities across Pennsylvania was correlated with the average number of asthma cases in thos

e cities. What type of study is this
Mathematics
1 answer:
bekas [8.4K]2 years ago
3 0

Answer:

Ecological study

Step-by-step explanation:

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If A=37 and b =6 find a
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Step-by-step explanation:

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3 years ago
find the width of radius r if the width w of the shaded region is 2cm and its area is 176cm^2, use 22/7 for pi (its a full circl
arsen [322]

The area of a shape is the amount of space it can occupy.

<em>The value of r is 13</em>

From the question (see attachment), we have:

\mathbf{A =176} --- area of the shaded region

\mathbf{w = 2} --- the width of the shaded region

The area of the complete circle would be:

\mathbf{A_1 =\pi (r + w)^2}

The area of the small circle is:

\mathbf{A_2 =\pi r^2}

So, the area of the shaded region is:

\mathbf{A = A_1 -  A_2}

Substitute known values

\mathbf{176 =\pi (r + w)^2 - \pi r^2 }

Substitute 2 for w

\mathbf{176 =\pi (r + 2)^2 - \pi r^2 }

Expand

\mathbf{176 =\pi (r^2 + 4r + 4) - \pi r^2 }

Open brackets

\mathbf{176 =\pi r^2 + 4\pi r + 4\pi - \pi r^2 }

Cancel out line terms

\mathbf{176 =4\pi r + 4\pi }

Divide through by 4

\mathbf{44 =\pi r + \pi }

Factor out pi

\mathbf{44 =\pi(r+ 1) }

Divide through by pi

\mathbf{r + 1= \frac{44}{ \pi} }

Substitute 22/7 for pi

\mathbf{r + 1= \frac{44}{ 22/7} }

Using a calculator, we have

\mathbf{r + 1= 14}

Solve for r

\mathbf{r= 14 -1}

\mathbf{r= 13}

Hence, the value of r is 13

Read more about areas of circles at:

brainly.com/question/23328170

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2 years ago
What is the place value 8 in the number 7,854.209
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The place value eight and that number is hundredths
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