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Daniel [21]
3 years ago
10

Find the area of this circle use 3.14 or 22/7 or pie round your answer to the nearest hundred if necessary

Mathematics
1 answer:
notka56 [123]3 years ago
6 0

Answer:

The area of the circle is 50.24 mm ²

Step-by-step explanation:

To solve this exercise we need to use the area formula of a circle:

a = area

r = radius = 4mm

π = pi = 3.14

a = π * r²

a = 3.14 * (4mm )²

a = 3.14 * 16mm ²

a = 50.24 mm ²

The area of the circle is 50.24 mm ²

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400.0 ml of a gas are under pressure of 80.0 kpa what would the volume of the gas be at a pressure of 100.0 kpa
Ber [7]

Answer:

The final volume is 320 mL at pressure of 100 kPa.

Step-by-step explanation:

Boyle's law gives the relation between volume and pressure of a gas. It states that at constant temperature, volume is inversely proportional to its pressure such that,

V\propto \dfrac{1}{P}\\\\P_1V_1=P_2V_2

Let

V_1=40\ mL\\\\P_1=80\ kPa\\\\P_2=100\ kPa

We need to find V_2. Using above equation, we get :

V_2=\dfrac{P_1V_1}{P_2}\\\\V_2=\dfrac{400\times 80\times 10^3}{100\times 10^3}\\\\V_2=320\ mL

So, the final volume is 320 mL at pressure of 100 kPa.

6 0
3 years ago
The area of the parallelogram is 273 square units. What is the height of the parallelogram? ____units
Alex17521 [72]

Answer:

h = 13 units²

Step-by-step explanation:

The way to find the area of a parallelogram is to multiply the length of one side (21) and multiply it by the height:

A = l*h

We know the area and the length:

273 = 21*h

Now we solve for height.

273/21 = (21*h)/21

273/21 = h

273/21 = 13

h = 13 units²

6 0
3 years ago
Write in standard form the equation of the line that has a slope of 2 and that passes through ( 3, -1) explain please!
Evgesh-ka [11]
Standard form.

y=mx+n

Where m is the slope and n is the point where x=0. Then, you have,
y=2x+n


To obtain n use the point they give you,

-1=2(3)+n

So n=-7 and then

y=2x-7
7 0
3 years ago
Find the sales tax.
Oksana_A [137]

$3.60 is the sales tax

After tax the price is $63.60

5 0
3 years ago
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Solve for ;x+20/2=3x
Alchen [17]
<span>x in (-oo:+oo)

(x+20)/2 = 3*x // - 3*x

(x+20)/2-(3*x) = 0

(x+20)/2-3*x = 0

(x+20)/2+(-3*2*x)/2 = 0

x-3*2*x+20 = 0

20-5*x = 0

(20-5*x)/2 = 0

(20-5*x)/2 = 0 // * 2

20-5*x = 0

20-5*x = 0 // - 20

-5*x = -20 // : -5

x = -20/(-5)

x = 4 so x= 4</span>
4 0
3 years ago
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