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shepuryov [24]
3 years ago
12

Factor completely 0.09y² - 0.81

Mathematics
1 answer:
NemiM [27]3 years ago
7 0

Answer:

0.09y^2 - 0.81 = (0.3y+0.9)(0.3y-0.9)

Step-by-step explanation:

The difference of squares formula gives us

a^2 - b^2 = (a+b)(a-b)

(you can multiply this out to confirm)

0.09y^2 = (0.3y)^2

and

0.81 = 0.9^2

Thus, by the difference of squares formula

0.09y^2 - 0.81 = (0.3y+0.9)(0.3y-0.9)

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AnnyKZ [126]

so first off for the ratios

if you were to find them on a graph, you would want to find a slope. The slope is your ratio pretty much

if you were to find them for a table, you would have to see what the question is asking. if it asking like what is the amount of people vs animals per square mile, you would find people on the table and then go down to square mile as opposed to square feet or some other variable. Then you will put what they are asking first and then what they are asking second. here ill show you an example if it is to confusing what i just said. if there are 50 animals per square mile and 150 people per square mile, and the question asked you what is the ratio between people and animals, you would answer 150/50, BUT you have to simplify. 3/1 would be you answer.

next off for the transformation

if there was a triangle at the points 5,3|4,6|5,5| and you wanted to translate it 5 units up and 6 units to the left, all you do is think about this. up and down are changes in the y, left and right are changes in the x axis. left and down are negative changes, up and right are positive changes.

so you would apply that thinking to ALL the points. it would look something like the picture below.

finally, for the shaded area of figures

lets take a abstract figure. say that we shade the upper left hand corner, and it will look something like the picture below. If you want to find the area of the figure, you would have to isolate it. Then you would multiply the width by the length and get 2.

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8 0
3 years ago
The circumference of the base of a cone is 24 inches. The slant height of the cone is 20 inches.
loris [4]

The surface area of a cone with circumference base of 24π inches and slant height of 20 inches is 384π inches² in terms of π.

<h3>Surface area of a cone</h3>

surface area = πr(r + l)

where

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  • l = slant height

Therefore,

l = 20 inches

24π = 2πr

r = 12

Therefore,

surface area  = π(12)(12 + 20)

surface area = 12π(12 + 20)

surface area = 12π × 32

surface area = 384π inches²

learn more on surface area here: brainly.com/question/2847956

6 0
2 years ago
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VikaD [51]
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4 years ago
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GrogVix [38]

Answer:

y = x - 2

Step-by-step explanation:

The equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y- intercept )

Here m = 1, thus

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To find c substitute (5, 3) into the partial equation

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lesya692 [45]

Answer:

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Step-by-step explanation:

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Therefore, the circumcenter of the right triangle Δ UVW will be (\frac{1}{2}, - \frac{1}{2}  ). (Answer)

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