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2 years ago

PLEASE HELP IMMEDIATELY, I NEED A RESPONSE TONIGHT!!!

Mathematics

1 answer:

Natasha2012 [34]2 years ago

3 0

Answer:

Step-by-step explanation:

The key fact is what are the trains doing: are they travelling toward one another or away from each other

Away from each other.

Train A has gone 50 km in 1 hour

Train B has gone 65 km in 1 hour.

They started off being 200 km apart

So their distance now is 50 + 65 + 200 = 315

Towards each other

This time they are eating into the 200 km

So you subtract

200 - 65 - 50 = 200 - 115 = 85 km.

Both trains are travelling in the same direct -- in B's direction

B - 65 + 50

200 - 15

185 km

Both trains are travelling in As direction

A - 50 + 65

200 + 15 = 215

The tricky part of this is which train is going in what direction?

As you can see, You have covered A C and D

The only one can't get is 115 (of course 315 didn't show up either).

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A triangular pyramid and its net are shown. Rain uses Calculations below to conclude that the surface area of a triangular pyram

Harman [31]

Answer:

Rain is correct, calculates correctly, 238.5 square inches

Step-by-step explanation:

The given triangular pyramid is shown with the dimensions.

The surface area of the triangular pyramid is given by :

$A=\frac{1}{2}\left(a \times b\right) + 3\left(\frac{1}{2}\times b\times s\right)$

$A=\frac{1}{2}\left(10 \times 8.7\right) + 3\left(\frac{1}{2}\times 10\times 13\right)$

$A=43.5+(3\times 65)$

$A=43.5+195$

$A=238.5 \ \text{inche}^2$

Therefore, the surface area of the triangular pyramid is = 238.5 square inches.

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3 years ago

What is the equation of a circle centered at the origin with radius 15?

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Answer:

Step-by-step explanation:

The equation of a circle centred at the origin is

x² + y² = r² ( where r is the radius )

Here r = 15, thus

x² + y² = 15² , that is

x² + y² = 225 → D

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3 years ago

Which of the following are statistical questions? How many text messages did you send today? What are the ages of the students i

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The answer to your question is C. Only lll

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Water starts out at a temperature of 62 F . It is heated such that its temperature increases at a rate of 8 F per minute. It tak

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Answer:

Step-by-step explanation:

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Main Idea: To evaluate an exponential growth or decay function, substitute a value for the exponent variable and simplify.

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If there is more to the answer than what I give please ask for more!

With $F(x) = 3^{x}$ we can find $F(4)$ by substituting 4 into the main function.

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Hope this helps!

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3 years ago