All categories

3 years ago

Please answer this correctly

Mathematics

2 answers:

Rus_ich [418]3 years ago

3 0

Answer: 879.20 km²

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

The diameter of the big circle is 2(10) + 18 = 38

divide the diameter by 2 to get the radius (r) = 19

Area (A) = π·r²

= π(19)²

= 361π

The diameter of the small circle is 18

divide the diameter by 2 to get the radius (r) = 9

Area (A) = π·r²

= π(9)²

= 81π

The area of the shaded region is the difference between the big circle and the small circle.

$Area_{shaded}=A_{big}-A_{small}$

= 361π - 81π

= 280π

= 280(3.14)

= 879.20

Naddika [18.5K]3 years ago

3 0

Answer:

879.20 km²

Step-by-step explanation:

Shaded area= Area of whole circle- area of white circle

Area of circle= πr²

Radius of whole circle= 10+18/2= 19 km

Area of whole circle= 3.14*(19 km)²= 1133.54 km²

Are of white circle= 3.14*(9 km)²= 254.34 km²

Shaded area= 1133.54 km²- 254.34 km²= 879.20 km²

<u>Answer is</u> 879.20 km²

You might be interested in

write an equation in slope intercept form satisfying the given equation : The line passes through (3,-8) and is parallel to the

nordsb [41]

Slope of the given line = 4
slope of the req. line = 4
equation of the line
y - y1 = m(x - x1)
y + 8 = 4(x - 3)
y + 8 = 4x - 12
4x - y - 12 - 8 = 0
4x - y - 20 = 0

8 0

4 years ago

I report if you answer randomly.

sasho [114]

Answer:

C. n=23; p^=0.5

Step-by-step explanation:

Normal distribution is symmetrical about the mean.

So, p should be close to ½

5 0

3 years ago

a 5-gallon mixture contains 40% acid. A 3-gallon mixture contains 50% acid. what percent acid is obtained by putting the two mix

natta225 [31]

so the 5 gallons ones is 40% acid, how much acid solute is in it anyway? well just 40% of 5 or namely 0.4*5 = 2 gallons.

the 3 gallons one is 50%, likewise it has 0.50 * 3 = 1.5 gallons of acid solute in it.

$\begin{array}{lcccl} &\stackrel{solution}{quantity}&\stackrel{\textit{\% of }}{amount}&\stackrel{\textit{gallons of }}{amount}\\ \cline{2-4}&\\ \textit{1st mixture}&5&0.4&\stackrel{(5)(0.4)}{2}\\ \textit{2nd mixture}&3&0.5&\stackrel{(3)(0.5)}{1.5}\\ \cline{2-4}&\\ mixed&8&p&3.5 \end{array} \\\\\\ 8p=3.5\implies p=\cfrac{3.5}{8}\implies p=0.4375\implies p=\stackrel{\%}{43.75}$

8 0

2 years ago

Christopher drove 360 miles this week. last week he drove 480 mile. what is the percent decrease in the number of miles christop

Harlamova29_29 [7]

Last week, Christopher drove 480 miles
This week, Christopher drove 360 miles

The difference in miles this week compared to last week = 480 - 360 = 120 miles.

The percentage of decrease in miles compared to last week's = (Difference in miles ÷ Total miles last week) multiplied by 100 = (120 ÷ 480) x 100 = 0.25 x 100 = 25%

8 0

4 years ago

Why x^2=16 and x^2=-16 do not have the same solution

77julia77 [94]

Step-by-step explanation:

x^2 = 16

x = ±4

x^2 = -16

x = -

as a negative number cannot be squareroot

7 0

2 years ago