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Rashid [163]
3 years ago
13

How can you calculate the area of the circle if you know the circle’s circumference?

Mathematics
1 answer:
Nimfa-mama [501]3 years ago
8 0
Divide the circumference by pi, then divide that by 2, then you would have the radius, and the area is r squared multiplied by pi
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PLEASE HELP!!<br> 4 Digit Lock *<br> Enter 4 digit number code with no spaces
sleet_krkn [62]
3451 now I’m just putting 20 characters to answer lol
6 0
2 years ago
A figure is located entirely in the third quadrant. If you reflect it over y = 0. Which quadrant will the resulting figure lie i
Varvara68 [4.7K]

Answer: Quadrant 2

=================================================

Explanation:

Check out the diagram below. An example point in the third quadrant is (-2,-5). This quadrant is the southwest quadrant. Reflect the example point over the x axis (aka the line y = 0) and we get (-2,5). This is shown when we go from point A to point B in the diagram.

The reflection rule is (x,y) \to (x,-y) showing that only the y coordinate changes from y to -y. If y is negative, then flip to positive, or vice versa. The x coordinate stays the same.

The point started in quadrant 3 and it moves to quadrant 2 after the reflection over the line y = 0.

Side note: all points on the line y = 0 have a y coordinate of 0

5 0
2 years ago
How many ounces of 50% alcohol solution must be mixed with 80 ounces of a 20% alcohol solution to make a 40% alcohol solution?
Paraphin [41]
X = amount of 50% solution
y = total amount after mixing

Note that the amount of alcohol in the 20% solution is 80 (0.2) = 16 oz.

We have 2 unknowns, so we need 2 equations:
first, we can write the equation for the total volume:
y = x + 80

next, apply the percentages to get an equation for the amount of alcohol:

0.4 y = 0.5 x + 16

Finally, solve the pair of equations (in this case, by substitution of the 1st into the second:
0.4 (x + 80) = 0.5x + 16
0.4 x + 32 = 0.5X + 16
rearrange and combine like terms:
0.1x = 16
x = 160
from the 1st equation:
y = 160 + 80 = 240
8 0
2 years ago
Explain how to write 28% as a rate per 100
harkovskaia [24]
28% equals 28/100.  So, 28% equals 28 per 100.
8 0
3 years ago
Reason on why xy=uv,uv=tv
blagie [28]
Can you please add the picture with the problem, then I will answer your question ?
3 0
3 years ago
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