The ratio of boys to girls in a homeroom at berkmar Middle School is 3:4. If there are 12 boys, how many girls are there in homeroom?

Answer:

The number of dolls sold 10,400

Step-by-step explanation:

Given:  The number N of dolls sold varies directly with their advertising budget A and inversely with the price P of each doll.

N = k(A/P), where k is the constant.

Now we have to find k.

Given: N = 5200, A = 26,000 and P = 30

5200 = k (26000/30)

5200 = k(866.67)

k = 5.99, when we round off we get k = 6

Now let's find the number of dolls sold when the ad amount increase to $52,000

Now plug k = 6, A = 52000 and p = 30

N = 6(52000/30)

N = (52000/5)

N = 10.400

Therefore, the number of dolls sold 10,400

Hope this will helpful.

Thank you.

Answer: The answer is -1

Step-by-step explanation:

-4(y - 2) = 12

-4y + 8 = 12

      - 8   - 8

_____________

  -4y  =  4

  ________

  -4        -4

      y = -1

The number of hours Tom took a trip of 1,020 miles is 3 hours.

Given that, Tom took a trip of 1,020 miles.

What is the speed?

The speedformula can be defined as the rate at which an object covers some distance. Speed can be measured as the distance traveled by a body in a given period of time. The SI unit of speed is m/s.

Tom traveled by train at 55 miles an hour and the same number of hours by plane at 285 mph.

Let the number of miles travelled by train be x. Then, the number of miles travelled by plane be 1020-x.

Time = x/55 = (1020-x)/285

⇒ 285x = 55 (1020-x)

⇒ 285x = 56100 - 55x

⇒ 285x + 55x = 56100

⇒ 340x= 56100

⇒ x = 56100/340

⇒ x = 165 miles

So, time = 165/55 = 3 hours

Therefore, the number of hours Tom took a trip of 1,020 miles is 3 hours.

To learn more about the speed, distance, and time visit:

brainly.com/question/4978052.

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Answer:

He traveled 3 hours by train and 3 hours by plane, so the trip take 6hours.

Answer:

B. 1:4

Step-by-step explanation:

This problem is on ratio of quantities.

step one:

what is a ratio?

A ratio is a way of expressing the relation of one quantity to another, it is usaully expressed in fraction as x/y, x:y or sometime x is to y

step two:

given that Betty won 5 hands

and Adam won 20 hands

step three:

Therefore the ratio of the number of hands Betty has won to the number of hands Adam has won is

=5/20

=1/4

or simply put 1:4

2x/3 - 9 = 7

2x/3 = 16

2x = 48

x = 24

The answer is 3.88888888889

The answer is 35/9

You first would remove the parentheses

Next you see that there is a subtraction symbol and a negative symbol right beside each other. You cant have 2 negatives side by side, so you change the symbol to addition

The problem then looks like this: 5/9 + 3 1/3

To make the problem easier you change the mixed number (3 1/3) to an improper fraction which is 10/3

Because its 5/9 + 10/3 you multiply 10 and 3 and get 30, and you keep the LCD (least common denominator) which is 9

Finally you add 5 + 30 = 35 and have 9 as your denominator

35/9 or 3 8/9