2 years ago

Which expression is equivalent to 15+3x?

Mathematics

1 answer:

Karo-lina-s [1.5K]2 years ago

5 0

Answer:

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Step-by-step explanation:

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Use the binomial theorem to write the binomial expansion of (x+3)4 but the 4 is Square

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A train leaves Los Angeles at 2 p.m. heading north at 50 mph. If the next train leaves three hours later and also heads north at

Mamont248 [21]

Since the first train has been travelling for 3 hours, we have the following equations:
$d=50t+3*50=50t+150$
$d=60t$

We want to know when they will be equal, so set these equal to eachother:
$60t=50t+150$
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So 15 hours after the second train leaves, they will be at the same distance. This is at 8AM since the second train leaves at 5PM.

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3 years ago

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Which equation results from adding the equations in this system?

eimsori [14]

Answer: 3x=3

Step-by-step explanation: Let's divide this into parts--

1. Adding the x variables: -2x+5x or 5x-2x = 3x.

2. Adding the y variables: y-y or -y+y = 0. (The negative and the positive y cancel each other out.)

3. Adding the numbers: 8-5 or -5+8 = 3.

Now just put it back into an equation: 3x + 0 = 3.

We don't need to add the 0, so the equation changes into 3x = 3.

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Based on this description, what conclusion did outsiders most likely draw about West African leaders after meeting Mansa Musa?

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