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grigory [225]
3 years ago
7

Which expression is equivalent to 91 + 39?

Mathematics
1 answer:
Montano1993 [528]3 years ago
7 0
C

Explation:
7+3= 10

13x10=130

91+39=130

Hope this helped!
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Which product is better to buy small 18 ounces for $3.25 or large 32 ounces for 5.50
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A 30-N stone is dropped from a height of 10 m and strikes the ground with a speed of 13 m/s.
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4.1 N

Step-by-step explanation:

We can solve this problem by using considerations about energy.

At the moment the stone is dropped, it has only gravitational potential energy:

PE=mgh

where

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h = 10 m is the initial height of the stone

As the stone falls, part of this energy is converted into kinetic energy, while part into thermal energy due to the presence of the air friction, acting opposite to the motion of the stone:

KE+E_t = \frac{1}{2}mv^2 + E_t

where:

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v = 13 m/s is the final speed of the stone

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E_t=W=Fh

where

F is the average force of friction

h = 10 m

Since the total energy must be conserved, we can combine the three equations, so we find:

mgh=\frac{1}{2}mv^2+Fh

And solving for F, we find the average force of air friction:

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3 years ago
Problem 2 Example 2: Bruno spends $23 at the arcade. He purchased two drinks and spent $17 on games. What was the cost of each d
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Answer:

$3

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To check:

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3 years ago
Read 2 more answers
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