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3 years ago

Please help me I need help!!!

Mathematics

2 answers:

Allisa [31]3 years ago

5 0

Answer:

942

Step-by-step explanation:

volume = 1/3 * pi * r^3

love history [14]3 years ago

5 0

Answer:

942

Step-by-step explanation:

Use the formula!

V= π R ^2 h/3

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Twice the sum of x and y decreased by 23

Andrew [12]

Answer:

2(x+y) - 23 or

2x + 2y - 23

Step-by-step explanation:

twice the sum of x and y means

2(x+y)

decreased means minus or -

decreased by 23 means

- 23

twice the sum of x and y decreased by 23

2(x+y) - 23

2(x+y) = 2x + 2y

2x + 2y - 23

5 0

1 year ago

Simplify the expression 4*4+4*x

leva [86]

Answer: The answer is 16+4x

Step-by-step explanation:

4*4 is 16 and 4*x is 4x since I can't add them together it would be 16+4x

8 0

3 years ago

In a running competition, a bronze, silver and gold medal must be given to the top three girls and top three boys. If 15 boys an

denis-greek [22]

Answer:

There are a total of possible 1820 results.

Step-by-step explanation:

Since there are two competitions, one for boys and one for girls, and we want all the possible results we will calculate the possible combinations for the boys and multiply them by the possible combinations for the girls. This is shown below:

$Boys = \frac{15!}{3!(15 - 3)!} = \frac{15!}{3!12!} = \frac{15*14*13*12!}{3!12!}\\Boys = \frac{15*14*13}{3*2*1}\\Boys = \frac{15*14*13}{3*2*1}\\Boys = 455$

$Girls = \frac{4!}{3!*(4 - 3)!}\\Girls = \frac{4*3!}{3!}\\Girls = 4$

Total number of possible results:

$results = 4*455\\results = 1820$

3 0

4 years ago

The perimeter of an equilateral triangle is 11 inches more than the perimeter of a square, and the side of the triangle is 6 inc

uysha [10]

Answer:

13 inches

Step-by-step explanation:

Let P(t) and P(s) be the perimeters of the equilateral triangle and square respectively. Similarly, t and s be the side lengths of equilateral triangle and square respectively.

According to the first condition :

(Perimeter of an equilateral triangle is 11 inches more than the perimeter of a square)

$\implies P(t) = P(s) + 11$

$\implies 3t = 4s + 11....(1)$

According to the second condition :

(The side of the triangle is 6 inches longer than the side of the square)

$\implies t = s + 6....(2)$

From equations (1) & (2)

3(s + 6) = 4s + 11

3s + 18 = 4s + 11

3s - 4s = 11 - 18

-s = - 7

s = 7 inches

$\because t = s + 6$

$\because t = 7 + 6$

$\because t = 13\: inches$

Thus the side of the triangle is 13 inches long.

7 0

3 years ago

Katie solved the equation by completing the square. X2+12x−7=0 which equation shows one of the steps katie could have taken to c

sdas [7]

solution:

$x^{2}+12x-7=0\\add 7 to both side of the equation\\x^{2}-12x=7\\to creat a trinomial square on the left side of the equation.\\find a value that is equal to the square of b and the cofficent of x.\\(\frac{b}{2})^2=(-6)^2\\add the term to each side of the equation\\x^2-12x+(-6)^2=7+(-6)\\x^2-12x+36=43\\(x-6)^2=43\\solve the equation for x.\\$ $take the square root of each side of the equation to the set up the solution x,\\(x-6)^2.\frac{1}{2}=\pm \sqrt{43}\\x-6=\pm \sqrt{43}\\x=6\pm \sqrt{43}$

4 0

3 years ago

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