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mars1129 [50]
3 years ago
5

A car travels 56.7 miles in a hour. If it continues at the same speed, how far will the car travel in 12 hours?

Mathematics
2 answers:
Furkat [3]3 years ago
7 0
If the car travels at the same speed for 12 hours the total miles will be 680.4
KIM [24]3 years ago
3 0
56.7 mph
56.7x12= 684.4
In 12 hours the car would travel 684.4 miles
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QUESTION 1

The given system of equations is

3d - e = 7...eqn(1)
d + e = 5...eqn(2)

To solve by linear combination, we add equation (1) to equation (2) to get,

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QUESTION 2


The given system is

4x + y = 5 ...eqn(1)

3x + y = 3 ...eqn(2)


To solve by linear combination, we subtract equation (2) from equation (1) to eliminate y from the equation.

This will give us,

4x - 3x = 5 - 3



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QUESTION 3

We want to solve the system;


a – 2b = –2 ....eqn(1)


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We need to add equation (1) to equation (2) to eliminate b.


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2a + a = 14 +  - 2




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3a = 12



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2b = 14 - 8


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b = 3


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11x + 4y = 18 ...eqn(1)

3x + 4y = 2 ...eqn(2)


We subtract equation (2) from equation (1) to get,


11x - 3x = 18 - 2


8x = 16


x = 2


Put x=2 into equation (2) to obtain,


3(2) + 4y = 2


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6 + 4y = 2


4y = 2 - 6


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The correct answer is (2,-1).




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2d + e = 8...eqn1

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2d + d = 8 + 4


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d = 4


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4 - e = 4

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