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3 years ago

A class consists of 55% boys and 45% girls. It is observed that 25%

Mathematics

1 answer:

xeze [42]3 years ago

8 0

Answer:

B 0.4545

Step-by-step solution

25/100 are boys and got an A

35/100 are girls got an A

so there are 25/55 students that got an a

if you convert to decimal its

0.4545...

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If 1900 square centimeters of material are available to make a box with a square base and an open top, find the largest possible

Evgen [1.6K]

Answer:

Volume = $7969$ cubic centimeter

Step-by-step explanation:

Let the length of each side of the base of the box be A and the height of the box be H.

Area of material required to make the box is equal to is $A^2 + 4*A*H.$

$A^2 + 4*A*H = 1900$

Rearranging the above equation, we get -

$`H = \frac{(1900 - A^2)}{(4*A)}$

Volume of box is equal to product of base area of box and the height of the box -

$V = A*A* H$

Substituting the given area we get -

$\frac{A^2*(1900 - A^2)}{4A} = \frac{(1900*A - A^3)}{4}$

For maximum volume

$\frac{dV}{dA} =0$

$\frac{ 1900}{4} - \frac{3*A^2}{4} = 0$

$A^2 = \frac{1900}{3}$

Volume of the box

= $\frac{\frac{1900}{3}*(1900 - \frac{1900}{3}) }{4 * \sqrt{\frac{1900}{3} } }$

= $7969$ cubic centimeter

3 0

3 years ago

At a concert, 20% of the audiences is sitting in the balcony. If there are 450 people sitting in the balcony, what is the total

elena-14-01-66 [18.8K]

....................

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3 years ago

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20 POINTS!!!

ZanzabumX [31]

It’s 00.9

Step-by-step explanation: I just took the test I know

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Rick bought a car for $17,500. Each year, the car's value decreases by 20%. At this rate, what can Rick expect the value of his

Arada [10]

Answer:

His car would be worth $15,502.24

Step-by-step explanation:

20% of 17,500 is 350. 350 x 6 = 2,100. 17,500 - 2,100 = 15,400. But that is not an answer choice so be go to the closest number which is $15,502.24

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3 years ago

Which angles are vertical to each other?

Nutka1998 [239]

The two vertical angles are FDE and JDI

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