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3 years ago

Please help!! I really need it Will mark brainliest

Mathematics

1 answer:

Fittoniya [83]3 years ago

7 0

Answer:

The last one and the second one

Step-by-step explanation:

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The amount of time it takes p people to paint d doors varies directly with the number of doors and inversely with the number of

yanalaym [24]

Answer:

4 people

Step-by-step explanation:

This problem is a compound rule of three problem. The variables are:

number of people, number of doors, amount of time

the amount of time increases if the number of doors decreases, but the amount of time decreases if the number of people increases.

We can solve this problem by parts (using two simple rule of three):

4 people can paint 10 doors in 2 hours

Let's first find how many people would take to paint 25 doors in 2 hours (we make the amount of hours constant, so the rule of three is between number of people and number of doors):

4 people -> 10 doors -> 2 hours

X people -> 25 doors -> 2 hours

4/X = 10/25

X = 25*4/10 = 100/10 = 10

It would take 10 people to paint 25 doors in 2 hours.

Now, we make a inverse rule of three between the number of people and amount of time:

10 people paint 25 doors in 2 hours, how many people paint 25 doors in 5 hours:

10 people -> 25 doors -> 2 hours

X people -> 25 doors -> 5 hours

10*2 = X*5

X = 20/5 = 4 people

4 0

3 years ago

In a one-month period, a convenience store

Vera_Pavlovna [14]

So, youd start by adding the two sales together to get total sales. Then you would divide that number by the gas sales to get the percent

65560+36740 = x

36740/ x = the percentage :)

8 0

3 years ago

What is the range of possible sizes for side x? PLEASE HELP

aleksandr82 [10.1K]

The answer would be 0.5

7 0

3 years ago

If an urn has 5 white balls 10 red balls what is the probability that 5 randomly selected balls contain exactly 3 white balls?

kondaur [170]

Answer:

0.15

Step-by-step explanation:

Without Mincing words let us dive straight into the solution to the question above. We are given the following information which is going to aid in solving this particular question.

====> It is given, that there are 5 white balls and 10 red balls. Hence, the number of the total balls = 5 white balls + 10 red balls = 15 balls.

Therefore, the probability that 5 randomly selected balls contain exactly 3 white balls = $\left[\begin{array}{ccc}5\\3\end{array}\right]$ × $\left[\begin{array}{ccc}10\\2&\end{array}\right]$ ÷ $\left[\begin{array}{ccc}15\\3\\\end{array}\right]$ = 450 ÷ 3003 = 0.15

3 0

3 years ago

pls help, i need to write an essay explaining what the difference is between finding the volume and total surface of a shape

Vinil7 [7]

Answer:

The surface area applies to how much space a SOLID objects occupies while volume is the space that a substance (solid, liquid, gas, or plasma) or shape occupies or contains, so volume can be anything.

Step-by-step explanation:

you can't really write an essay-

8 0

3 years ago

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