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3 years ago

A train is traveling at 60 mph. If the rate of speed increases 4 mph each hour,

Mathematics

1 answer:

Alenkasestr [34]3 years ago

6 0

Answer:

B) 5 hours

Step-by-step explanation:

First, find the amount of mph between 60 and 80:

80 - 60

= 20 mph

Since the speed increases 4 mph per hour, we can find how long it will take to get to 80 mph by dividing 20 by 4:

20/4

= 5

So, the correct answer is B, 5 hours

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Answer:

It forms a 90 degree angle

Step-by-step explanation:

Since a circle is 360 degrees, 1/4 of that would be 90.

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Scientists need to know how gravity acts on space shuttles so they can put the space shuttle in orbit. They use an equation that

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The equation is a scientific law, Newton's Law of Gravity,

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3 years ago

The heights of women aged 20 to 29 are approximately normal with mean 64 inches and standard deviation 2.7 inches. Men the same

ohaa [14]

Answer:

z=(x-mu)/o

Step-by-step explanation:

X - Heights of women aged 20 to 29: X is N(64, 2.7)

Y - Heights of men aged 20 to 29: X is N(69.3, 2.8)

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3 years ago

By using sum or difference formulas, cos(π−x) can be written as

Liono4ka [1.6K]

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3 years ago

At a hockey game a vendor sold a combined total of 110 sodas and hot dogs. The number of hot dogs sold was 42 less than the numb

jasenka [17]

76 sodas and 34 hot dogs were sold by the vendor.

Step-by-step explanation:

Given,

Total sodas and hot dogs sold = 110

Let,

x be the number of sodas sold

y be the number of hot dogs sold

According to given statement;

x+y=110 Eqn 1

y = x-42 Eqn 2

Putting value of y from Eqn 2 in Eqn 1

$x+(x-42)=110\\x+x-42=110\\2x=110+42\\2x=152$

Dividing both sides by 2

$\frac{2x}{2}=\frac{152}{2}\\x=76$

Putting x=76 in Eqn 1

$y=76-42\\y=34$

76 sodas and 34 hot dogs were sold by the vendor.

Keywords: linear equation, substitution method

Learn more about substitution method at:

#LearnwithBrainly

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3 years ago