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3 years ago

The mean age of 5 people in a room is 40 years.

Mathematics

1 answer:

max2010maxim [7]3 years ago

7 0

Answer:

22years

Step-by-step explanation:

The sum of ages of people in the room is 40 * 5= 200

[ Remember mean = total ahead of people/ number of people]

Let the age of the 6th person be X

200+x. / 6 = 37

200 + x = 37 * 6 = 222

x = 222- 200 = 22

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In four years, 40% of a radioactive element decays. Find its half-life. Round to one decimal place.

White raven [17]

To find the answer, use $k = \frac{2.303 }{ 4} (log\frac {100 }{ 40})$ , and then use the equation $t=\frac{.693}{k}$ To find it's half life.

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4 years ago

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a rectangular fish tank hold 12 fish, A round fish tank hold 3 fish. How many times as many fish dose the rectangular tank hold

ch4aika [34]

Answer:

4 times

Step-by-step explanation:

You divide 12 by 3

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3 years ago

Find the Area of the figure below, composed of a rectangle and a semicircle.

Mamont248 [21]

Answer:

68.1 units²

Step-by-step explanation:

Start by finding the area of the rectangle...

$Area=lw\\Area=6*9\\Area=54$

Then, find the area of the semicircle...

$Radius=\frac{1}{2}*Diameter=\frac{1}{2}*6=3$

$Area=\frac{1}{2}\pi r^2\\Area=\frac{1}{2}\pi 3^2\\Area=\frac{1}{2}\pi 9\\Area=\frac{9}{2}\ pi\\Area\approx14.1$

Now, add the two to get...

54+14.1=68.1

3 0

2 years ago

16 is what percent of 80

Vsevolod [243]

Answer:

your answer is 20%

Step-by-step explanation:

16/80 = .2 = 20%

7 0

3 years ago

Oh lord help q-q I have like no time left-

galina1969 [7]

Answer:

(Triangular pyramid)

Lateral area = 1650 $m^{2}$

Total surface area = 1860.1 $m^{2}$

(Triangular prism)

Volume = 660 $cm^{3}$

Step-by-step explanation:

For the triangular pyramid

Area of triangle = $\frac{1}{2}$ × base × height

Area of the base = $\frac{1}{2}$ × 22 × 19.1 = 210.1

Area of the sides = $\frac{1}{2}$ × 22 × 50 = 550

Number of sides (excluding base) = 3

∴ Total Area = 210.1 + (550 × 3)

= 210.1 + 1650 = 1860.1 $m^{2}$

Lateral Area = (550 × 3) = 1650 $m^{2}$

For the triangular prism

Area of the triangle = $\frac{1}{2}$ × 12 × 5 = 30

Volume = Area x Height

Volume = 30 × 22 = 660 $cm^{3}$

5 0

3 years ago