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3 years ago

Identify the value of a

Mathematics

1 answer:

Amanda [17]3 years ago

4 0

Use exponential law, we have

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What is the value of x

harkovskaia [24]

The value is 3!!!!!!

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3 years ago

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KIM [24]

Answer:

B C D brainlest please

Step-by-step explanation:

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3 years ago

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-x+4(x+3)=-12 is this never true or always true

rodikova [14]

Answer: Never true.

Step-by-step explanation: Distribute the numbers: 4 times x is 4x, 4 times 3 is 12. Then you have the equation: -x+4x +12 = -12. Now, choose a random number, maybe -4. A negative plus a negative cancels out so you are left with 4-16(Because you distribute the number) +12 = -12. 4-16 is -12. -12 plus 12 equals 0.

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3 years ago

Two trains started moving at the same time, train A from Boston to New York, and train B from New York to Boston. The distance b

Ede4ka [16]

Answer:

After 1.7 hours

Explanation:

1. Calculate the average speed of train B

60mph = 3/4 (s) ⇒ s = 60 (4/3) mph = 80 mph

2. Build a table

When the two trains meet:

Train Average speed Distance time (distance/average speed)

mph

A 60 x x/60

B 80 240 - x (240 - x) / 80

3. Write the equation

The time, when the two trains meet, is the same for both trains:

$\dfrac{x}{60}=\dfrac{240-x}{80}\\ \\ \\ 80x=14,400-60x\\ \\ 80x+60x=14,400\\ \\ 140x=14,400\\ \\ x=14,400/140\\ \\ x=102.85miles$

4. Calculate the time:

x/60 = 102.86 / 60 = 1.7 hours

The two trains will meet after 1.7 hours

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3 years ago

How to simplify -3 (4×-5y-5×)

VMariaS [17]

Distribute -3 to the rest of the numbers by multiplying them together. That’s all you need to do you don’t have to solve

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3 years ago

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