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sweet-ann [11.9K]
3 years ago
10

The train traveled at a speed of 90 miles per hour for 3 hours then slowed down to 72 miles per hour for the next 1 1/2 hours. W

hat is the total number of miles the train traveled?
Mathematics
1 answer:
Viefleur [7K]3 years ago
4 0

Answer:

378 miles

Step-by-step explanation:

<u>Remember that (rate)(distance) = time</u>

The train is going 90 mph for 3 hours. That's 270 miles in 3 hours.

Then you would multiply 72 (mph) by 1 1/2 (hours) and get 108 miles traveled in 1 1/2 hours.

Add those together and you get 378.

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Expected Mean, E(X), is obtained by multiplying each pair of x and its P(x) and add up the answers

E(X) = (0×0.7) + (1×0.2) + (2×0.1) = 0.4

The formula to calculate the variance, Var(X), is given by E(X)² - (E(X))²

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3 years ago
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Step-by-step explanation:

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What is the total displacement of a student who walks 3 blocks east, 2 blocks north, 1 block west, and then 2 blocks south?
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3 0
2 years ago
Ashley drove 260 miles using 12 gallons of gas. At this rate, how many gallons of gas would she need to drive 286 miles?
Elena-2011 [213]

Answer:

She will need 13.2 gallons to drive 286 miles

Step-by-step explanation:

Step 1

Consider the expression below;

T=G×N

where;

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N=quantity of gas consumed

This can also be expressed as;

Total miles=number of miles per gallon×number of gallons

In our case;

T=260 miles

G=unknown

N=12 gallons

replacing;

260=G×12

12 G=260

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Step 2

Using the same expression;

T=G×N

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replacing;

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N=13.2 gallons

She will need 13.2 gallons to drive 286 miles

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