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Vanyuwa [196]
3 years ago
15

Which phrase describes an unknown or changeable quantity?

Mathematics
1 answer:
Artist 52 [7]3 years ago
7 0
B i think that because there’s no quantity
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A 500 g model train car traveling at 0.8 m/s collides with a 300 g stationary car. The cars hook up and move off down the track
sdas [7]

Answer:

0.5ms^{-1}

Step-by-step explanation:

Let v be the speed after the collision of both the cars.

Now, momentum is given by: mass × velocity, then by equating the total momentum before and after the collision of the two cars, we get

500{\times}0.8+300{\times}0=(500+300)v

⇒400+0=800v

⇒400=800v

⇒v=0.5ms^{-1}

Thus, they are moving at the velocity of 0.5ms^{-1}

3 0
4 years ago
Read 2 more answers
Out of a total of 10 college textbooks estimate the standard deviation of their ages if the oldest textbook is known to be 7.9 y
tamaranim1 [39]

Answer:

Given that the maximum age of the textbook is 7.9 years and the minimum age of the textbook is 1.3 years.

Using the range rule, the standard deviation is estimated as,

S≈maximum−minimum/4

=7.9−1.3/4

=1.65

The required value of the approximate standard deviation is 1.65.

8 0
3 years ago
Never mind. No question. Can’t delete.
Evgen [1.6K]
Oof it be like that
4 0
3 years ago
Read 2 more answers
A red candle is 8 inches tall and burns at a rate of 710 inch per hour. a blue candle is 6 inches tall and burns at a rate of 15
Katarina [22]
Red candle:
Initial height  = 8 in
Burn rate = 710 in/h
After x hours, the height will be
h₁ = 8 - 710x

Blue candle:
Initial height = 6 in
Burn rate = 15 in/h
After x hours, the height will be
h₂ = 6 - 15x

When the two heights are equal, then
h₁ = h₂
8 - 710x = 6 - 15x
-695x = -2
x = 0.00288 hours

Answer:
The answer may take one of these forms:
0.003 hours, or
0.0029 hours, or
0.00288 hours.

3 0
3 years ago
out of a senior class of 100 students the.class offers (president vice president treasurer needs to be arranged.com how many dif
kondaur [170]
Answer: 33

explanation: 100/3 = 33.333, and since it isn't possible for 0.333 to be three different students being picked, there are only 33 different ways.
8 0
2 years ago
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