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3 years ago

Why do we need to construct table in getting POPULATION VARIANCE?

Mathematics

1 answer:

son4ous [18]3 years ago

3 0

Answer:

it's helps it by standing

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a family has two cars. the first car has a fuel efficiency of 20 miles per gallon of gas and the second has a fuel efficiency of

nikklg [1K]

Car A consumes 25 gallon and car B consumes 15 gallon.

Step-by-step explanation:

Given,

The fuel efficiency of car A = 20 miles per gallon.

The fuel efficiency of car B = 15 miles per gallon.

In a week, two cars went 725 miles and consumed 40 gallons.

To find the consumption of each car in that week.

Let,

Car A consumed x gallon

Car B consumed y gallon.

According to the problem,

x+y = 40 ----- (1)

20x+15y = 725

or, 4x+3y = 145 -------- (2)

From (1) we get, x = 40-y

Putting the value of x in (2) we get,

4(40-y)+3y = 145

or, 160-4y+3y = 145

or, -y = 145-160

or, y = 15

From (1) we get, x = 40-15 = 25

Hence,

Car A consumes 25 gallon and car B consumes 15 gallon.

7 0

3 years ago

When a water-cooled nuclear power plant is in operation, oxygen in the water is transmuted to nitrogen-17. After the reactor is

wolverine [178]

Answer:

The differential equation is $\frac{dR}{dt} = -kR$

Step-by-step explanation:

Differential equation for the rate of change in radiation level:

Radiation level is R.

Rate of change indicates that the radiation level R varies in function of time t, which mathematically means that we have:

$\frac{dR}{dt}$

After the reactor is shut down, the radiation from the nitrogen-17 decreases in such a way that the rate of change in the radiation level is directly proportional to the radiation level.

Rate of change is k. Decreases means that k is negative. Proportional to the radiation level of R means that -k multiplies R. So the differential equation is:

$\frac{dR}{dt} = -kR$

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3 years ago

Geoff charges 27$ for 3 hours of swimming lessons

igor_vitrenko [27]

Answer: 27/3=9 which means 9$ per hour

32/4=8 which means 8$ per hour

Step-by-step explanation:

Answers is annie deal is the best

6 0

3 years ago

Read 2 more answers

Which expression represents the product of s and 39? A=39-s B=39÷s C=39s D=39+s

Degger [83]

The answer would be c because it means Multiply and whenever a variable is next to a number in this case 39s then that means it a multiplication
So C. 39s

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3 years ago

A car is moving at a rate of 72 km/hr. How far does the car move when it stops after 4 seconds? anwer is 125m

ludmilkaskok [199]

<h2>REFERS TO THE ATTACHMENT.</h2>

<h2>PLEASE MARK ME AS BRAINLIEST:</h2>

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3 years ago