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AURORKA [14]
3 years ago
15

What's is the best estimate of 21% of 387

Mathematics
2 answers:
morpeh [17]3 years ago
7 0
387x 21%= 81.27 (estimate is 81.00)

x/387 = 21/100 (cross multiple)

387x21= 8127  and 100x x= 100x  (then divide each product by 100)

8127/100 = 81.27    100x/100= x

81.27=x






kompoz [17]3 years ago
4 0
21% of 387 is 81.27 Hope it helps
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Consider the following proposed proof by contradiction that for all positive integers n, 3n > 2.
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Answer:

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The proof is rigourous and well written, so we discard the second answer.

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3 years ago
What is 19 x 3.564239
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Read 2 more answers
What is the result of a dilation of scale factor 3 centered at the origin of the line 2y + 3x=10?? PLEASE HELP PLEASEEEEEEEEE
maks197457 [2]

Given:

The equation of a line is:

2y+3x=10

The line is dilated by factor 3.

To find:

The result of dilation.

Solution:

The equation of a line is:

2y+3x=10

For x=0,

2y+3(0)=10

2y+0=10

y=\dfrac{10}{2}

y=5

For x=2,

2y+3(2)=10

2y+6=10

2y=10-6

2y=4

Divide both sides by 2.

y=\dfrac{4}{2}

y=2

The given line passes through the two points A(0,5) and B(2,2).

If the line dilated by factor 3 with origin as center of dilation, then

(x,y)\to (3x,3y)

Using this rule, we get

A(0,5)\to A'(3(0),3(5))

A(0,5)\to A'(0,15)

Similarly,

B(2,2)\to B'(3(2),3(2))

B(2,2)\to B'(6,6)

The dilated line passes through the points A'(0,15) and B'(6,6). So, the equation of dilated line is:

y-y_1=\dfrac{y_2-y_1}{x_2-x_1}(x-x_1)

y-15=\dfrac{6-15}{6-0}(x-0)

y-15=\dfrac{-9}{6}(x)

y-15=\dfrac{-3}{2}x

Multiply both sides by 2.

2(y-15)=-3x

2y-30=-3x

2y+3x=30

Therefore, the equation of the line after the dilation is 2y+3x=30.

3 0
3 years ago
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