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3 years ago

Determine whether each statement is always, sometimes, or never true.

Mathematics

1 answer:

Ratling [72]3 years ago

3 0

Answer:

Both are sometimes true

Step-by-step explanation:

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The Hoover Dam in the U.S produces 2 x 10 ^9 Watts of electricity and is composed of 7 x 10^9 kg of concrete. Concrete requires

kondaur [170]

Answer:

1) $7 x 10^{15} J$

2) $40.5$ days

Step-by-step explanation:

1) First of all we use $1MJ=1x10^{6}J$ so the total energy will be $7x10^{9} kg * 1x10^{6} \frac{J}{kg} =7x10^{15}J$ .

2)Then we use $1W=1\frac{J}{s}$ and $Time=\frac{7 x 10^{15} J }{2x10^{9}J/s} =3.5x10^{6}s$ or $3.5x10^{6}s*\frac{1h}{3600s}*\frac{1day}{24h} =40.5 days$

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3 years ago

A sphere has a radius of 15 m. If the radius is divided by 5, what is the effect on the surface area?

Romashka [77]

The surface area is multiplied by 5.
The surface area is divided by 5.
The surface area is divided by 25.
The surface area is multiplied by 25.

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3 years ago

2. Samuel used clay to make a diorama of the pyramids in Ancient Egypt. He made two triangular pyramids and three rectangular py

zalisa [80]

Answer:

$124.16$ cubic meter of clay will be used to create all the pyramids

Step-by-step explanation:

The remaining part of the question is given in the attached file

Solution

The total clay used is equal to the sum of volumes of two triangular and three rectangular pyramids.

For Rectangular Pyramid,

Volume of three rectangular pyramids

$3 * \frac{BH}{3} = BH$

Substituting the given values in above equation, we get -

$15.5 * 5 = 77.5$ cubic centimeter

For triangular Pyramid,

Volume of two triangular pyramids

$2 * \frac{BH}{3}\\2 * \frac{10 * 7}{3}$

$46.67$ cubic centimeter

Total clay used = Volume of 3 rectangular pyramid + volume of 2 triangular pyramid $= 77.7 + 46.67 = 124.16$ Cubic centimeter

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3 years ago

The table represents the balance of Fernando’s loan, y, over a period several months, x. He used technology to create the scatte

vlada-n [284]

Answer:

The balance of the loan will be approximately $15,000. - Month 16

The balance of the loan will reach $0. - Month 50

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3 years ago

How do you determine whether each triangle with sides of given lengths is a right triangle

sveticcg [70]

If it is a 90 degree angle. Strait up and strait flat. Picture the corner of a perfect square. Hope this helps! :)

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3 years ago