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3 years ago

What is 18.57 trillion rounded to the nearest ten-trillion

Mathematics

2 answers:

SOVA2 [1]3 years ago

6 0

we know that

nearest ten means multiple of 10

Like- 10 , 20 , 30 , 40

whichever is close

Here , we are given

18.57 trillion

and we know that

18.57 is between 10 and 20

but it is more close to 20

because difference between 18.57 and 20 is 1.43

while difference between 18.57 and 10 is 8.57

so, we always consider more close value

so,

18.57 trillion rounded to the nearest 20 trillion ...........Answer

dalvyx [7]3 years ago

4 0

The answer is 20 trillion brainliest please

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The perimeter of a rectangle is 42 inches, and its area is 110 square inches. find the length and width of the rectangle.

lorasvet [3.4K]

$p = 2w + 2l$ $p = 42$
$a = l * w$ $a = 108$

You want to make either the length or width variable (I chose the width variable to be by itself. It doesn't matter) by itself by:

Divide both sides by 2.
(p) ÷ 2 = (2w + 2l) ÷ 2
$2's$ $cancel$ $out$
$\frac{p}{2} = w + l$

Subtract both sides by either length or width depending on what variable you chose to make by itself (in this case I subtracted the length variable because I wanted the width variable by itself).
$\frac{p}{2} - l = w + l - l$
$l's$ $cancel$ $out$
p/2 - l = w

$a = l * w$

You replace w with the equation above p/2 - l = w
$a = l( \frac{p}{2} - l)$

Multiply out the L.
$a = \frac{p}{2}l - l^{2}$

Plug in all your numbers a = 110 and p = 42
$110 = \frac{42}{2}l - l^{2}$
$110 = 21l - l^{2$

Move everything to the left side so $l^{2}$ would be positive (makes the equation easier when $l^{2}$ is positive).
$l^{2} - 21l + 110 = 0$

Factor.
$(l -10)(l-11) = 0$

Make each parenthesis set equal to 0.
$l-11=0$ $l-10=0$

Add.
$l = 11$ $l = 10$

By doing this you solve for both the width and length so the answer is:
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3 years ago