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agasfer [191]
3 years ago
9

A freight train travels at 30 mph. If the freight train is 300 miles ahead of an express train traveling at 55 mph, how long wil

l the express train take to overtake the freight train?
Mathematics
1 answer:
nikdorinn [45]3 years ago
7 0
Let the time elapsed be x, then
30x + 300 = 55x
55x - 30x = 300
25x = 300
x = 300/25 = 12

Therefore, it will take the express train 12 hours to overtake the freight train.
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GrogVix [38]
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What is an equation of the line that is parallel to y=9−5x and passes through (0, 8) ?
TEA [102]

Answer:

y = -5x Y8  

Step-by-step explanation:

Parallel lines have the same slope.

Your function is

y = 9 − 5x = -5x+ 9

slope = -5

The parallel line

The line must have slope = -5 and include (0, 8), so

8 = -5×(0) + b

8 = 0 + b

b = 8

The equation for the parallel line is

y = -5x + 8

In the diagram below, the red line is the graph of y = 9 -5x.

The parallel blue line is the graph of y = -5x + 8.

8 0
3 years ago
If f(x) = -7x+2 and g(x) = square root of x+3,<br> what is (fºg)(-2)?
Degger [83]

Answer:

(fog)(-2)=-5

Step-by-step explanation:

Given

f(x)= -7x+2

and

g(x)= √(x+3)

For finding (fog)(-2), we have to find (fog)(x) first

In order to find (fog)(x) we will put the value of g(x) in f(x) in place of x.

(fog)(x)= -7g(x)+2

Putting the value of g(x)  

(fog)(x)= -7√(x+3)+2

We have to find (fog)(-2), so we have to put at the place of x in the composition

(fog)(-2)= -7√(-2+3)+2

(fog)(-2)= -7√1+2

= -7(1)+2

= -7+2

=-5

So,

(fog)(-2)=-5

6 0
3 years ago
Read 2 more answers
How do I solve this? help please! xx
Anna35 [415]
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Present your answer like this:
               x, (-3,-1)
f(x) =      -1, (-1,0)
               one more here
               one more here

5 0
3 years ago
What is angle A? 313 degrees 133 degrees 143 degrees 147 degrees
Evgesh-ka [11]

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Step-by-step explanation:

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3 years ago
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