How much water should be added to 18ml of 10% alcohol solution  to reduce to reduce the concentration to 9%

The length of a rectangular snow fort is 7 feet and the width of a rectangular snow fort is 5 feet.

Given that, Chris Built a rectangular snow fort with a perimeter of 24 feet.

What is the perimeter of a rectangle?

The perimeter of a rectangle is the total distance of its outer boundary. It is twice the sum of its length and width and it is calculated with the help of the formula: Perimeter = 2(length + width).

Let x be the length of a rectangular snow fort and y be the width of a rectangular snow fort.

The length of the fort was 8 feet less than 3 times the width.

y=3x-8

Now, 2(y+x)=24

⇒ 3x-8+x=12

⇒ 4x=20

⇒ x=5

So, y=3x-8=7

Therefore, the length of a rectangular snow fort is 7 feet and the width of a rectangular snow fort is 5 feet.

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Answer:

The answer is 4

Step-by-step explanation:

10x+24=64

10x=64-24

10x=40

x=40/10

x=4

Answer:

c

Step-by-step explanation:

Final answer:

The $5 gift cards can be given to 3 of the 9 volunteers in 84 different ways.

Explanation:

This is a combination problem because the order in which the gift cards are given does not matter.

To find the number of ways the gift cards can be given to 3 of the 9 volunteers, we can use the combination formula:

C(n,r) = n! / (r!(n-r)!)

In this case, n = 9 (the number of volunteers) and r = 3 (the number of gift cards to be given).

Plugging in the values, we get:

C(9,3) = 9! / (3!(9-3)!) = 84

Therefore, there are 84 ways to give the $5 gift cards to 3 of the 9 volunteers.

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Answer:

This formula is related to Pythagorus theorem which states that in a right angled triangle square of hypotenuse is equal to sum of the squares of other two sides.

In other words, C²=B²+A²