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lilavasa [31]
3 years ago
9

I need help please :( i really need help

Mathematics
1 answer:
german3 years ago
4 0

Answer:

8^18

Step-by-step explanation:

Good luck to you! = wellcome

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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
melisa1 [442]
Distance<-------------300--------------><-------------------x----------------->
          ⊕---------------------------------⊕--------------------------------------⊕                      Express                                  Freight                            Overtaking point
   Speed 55                              speed 30

Let x be the distance travelled by Freight until the point of overtaking
Time = Distance/Speed, then:

Time (freight) = Distance (fright)/Speed (freight) And
Time (Express) = Distance (Express)/Speed (Express).
Now plug in the relative number:

Time (freight) = x/30  and Time (express) = (x+300)/55. But note that both times are equal, then:
x/30 = (x+300)/55 OR (x÷30 = (x+300)÷55) [Answer C]
Now let's find the distance x. Cross multiplication;

55x= 30(300+x) →55x = 9,000 + 30x
55x - 30x = 9,000 → 25x = 9,000 and x = 9,000/25 = 360 miles
Time needed for Freight to travel 360 m = 360/30= 12 Hours
Time needed for Express to travel (300+360) m = 660/55= 12 Hours
As you see, it's the same time of 12 hours
Don't forget that Distance = Speed x time or time = Distance/Speed, etc.

4 0
3 years ago
Read 2 more answers
13- 0.7w + 8x when w = 12 and x = 1/2
cupoosta [38]
Simplify the expression and you get: 8.6
Hope this helps!
8 0
3 years ago
I will mark you Brainliest if your response is correct. Also, I'm offering 20 points.
posledela

Answer:

740 m^2

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
A year has four seasons. What is the probability that a day chosen at random will be in the spring?
mestny [16]

Answer:

1/4; 25%

Step-by-step explanation:

if a year has four seasons we can say that there are 4 possibilities

spring appears once

this means that the probability that a day chosen at random will be in spring would be 1 out of 4

or 25%

6 0
2 years ago
The given function models the number of cars that are put through a quality control test each hour at a car production factory.
Annette [7]

hours each day.

Step-by-step explanation:

The given function models the number of cars that are put through a quality control test each hour at a car production factory.

The given function is

We need to find the number of hours does the quality control facility operate each day.

Rewrite the given function it factored form.

Taking out the common factors from each parenthesis.

The factored form of given function is c(t)=-(t-10)(t+2).

Equate the function equal to 0 to find the x-intercept.

Number of hours cannot be negative. So from t=0 to t=10 quality control facility operate the cars.

Therefore the quality control facility operates for 10 hours each day.

7 0
3 years ago
Read 2 more answers
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