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4 years ago

Some Geometry problems I need some help with!

Mathematics

1 answer:

drek231 [11]4 years ago

8 0

Answer:

When a 2-D circle is rotated around a line that it does not touch. What is the name of the resulting figure?

The answer is annulus

A sphere with radius 16 m is cut by a plane though it’s a great circle. What is the best description of the cross section that is shown?

B. A circle with radius 16 m

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At what speed does a car travel if it goes 375 miles in 7 hours<br> Explain

solniwko [45]

We are trying to find it's speed which is measured in miles per hour or miles/hour
So: 375 miles/7 hours
This simplifies to 53.5714286 miles per hour.

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3 years ago

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How do you use an exponent to repersent a number such as 16

kari74 [83]

2*2*2*2 or 2^4 is an exponent to represent 16

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3 years ago

A pot is being used to boil off 1 kg of water. The specific energy required to cause the phase change is 2297 kJ/kg. Assuming th

lana66690 [7]

Answer:

It will take 58 seconds

Step-by-step explanation:

If you have 1 kg of water in the jar, half of it will be 0.5 kg.

To vaporize half of the water (0.500 kg) the energy supply needed is

$2297 kJ/kg*0.5kg=1148.5 kJ$

If the stove is supplying 20 kJ/s, the time its needed is

$\frac{1148.5 kJ}{20\frac{KJ}{s} }=57.425 s$

It will last at least 58 seconds to vaporize half of the water.

6 0

3 years ago

What is the solution 7^x=49

Ede4ka [16]

Answer:

x=2

Step-by-step explanation:

Divide 49 by 7, and you get 7 which is a perfect square

Let's test it out!

7^x=49

7^(2)=49

49=49

It works out!

6 0

4 years ago

Which number sentence is true?

Nataly [62]

The number sentence that is true is B. 2.9 x 104 < 2.25 x 1011
2.9 x 104 = 301.6
2.25 x 1011 = 2,274.75
Therefore, 301.6 is less than (<) 2,274.75

4 0

3 years ago