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3 years ago

12

According to the article, "How Can Your Smartphone Make Water Safe to Drink," less than 1% of phone's battery disinfects how muc

h water? *

1 answer:

Paha777 [63]3 years ago

7 0

Answer:

700 A

Step-by-step explanation:

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A page should have perimeter of 42 inches. The printing area within the page

Tamiku [17]

Overall dimensions of the page in order to maximize the printing area is page should be 11 inches wide and 10 inches long .

<u>Step-by-step explanation:</u>

We have , A page should have perimeter of 42 inches. The printing area within the page would be determined by top and bottom margins of 1 inch from each side, and the left and right margins of 1.5 inches from each side. let's assume width of the page be x inches and its length be y inches So,

Perimeter = 42 inches

⇒ $2(x+y) = 42\\x+y = 21\\y = 21-x$

width of printed area = x-3 & length of printed area = y-2:

area = $length(width)$

$area = (x-3)(y-2)\\area = (x-3)(21-x-2)\\area = (x-3)(19-x)\\area = -x^{2} + 22x -57$

Let's find $\frac{d(area)}{dx}$ :

$\frac{d(area)}{dx}$ = $\frac{d(-x^{2}+22x-57)}{dx} = -2x +22$ , for area to be maximum $\frac{d(area)}{dx}$ = 0

⇒ $-2x+22 = 0\\2x =22\\x=11 inches$

And ,

$y = 21-x\\y = 21-11\\y = 10 inches$

∴ Overall dimensions of the page in order to maximize the printing area is page should be 11 inches wide and 10 inches long .

7 0

3 years ago

you scored 72% on the Unit 1 exam and then 90% on the unit 2 exam. what was your percentage acorr increase

iVinArrow [24]

The difference between 90% and 72% is 18%

6 0

3 years ago

Stefan measured a weight of a package as 15.375 pounds. The actual weight of the package is 15.125 pounds.

Ainat [17]

15.375/15.125 x 100 =~98.4

The ~% is 98.4%
Error = ~2.6%

Part B

Be a near amount. Can be

5 0

3 years ago

Find the sum of (x + 5) and (2x + 3)

Genrish500 [490]

What you can do is subtract 1x from each side
Then you subtract 3 from each side
Then it tells you x=2
Always put what you think x is back into the problem and see if it works out

Example on how you do it:
(x+5)=(2x+3)
5=(x+3)
2=x

7 0

3 years ago

What is the volume of a hemisphere with a radius of 3.6m ,rounded to the nearest tenth of a cubic centimeter

Mrrafil [7]

Answer:

$V\approx 97.7\ m^3$

Step-by-step explanation:

-A hemisphere is equivalent to half of a sphere.

- The area of a sphere is given by the formula:

$V=\frac{4}{3}\pi r^3$

-Given that r=3.6m, the hemisphere's volume can be calculated as:

$V=\frac{4}{3}\pi r^3\\\\V_h=0.5\times \frac{4}{3}\pi r^3\\\\=0.5\times \frac{4}{3}\pi \times 3.6^3\\\\=97.7161\approx 97.7\ m^3$

Hence, the hemisphere's volume is approximately $97.7\ m^3$

6 0

3 years ago