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2 years ago

13

What is the value of 15C2?

1 answer:

zaharov [31]2 years ago

7 0

This is just 15 molecules of C2 or carbon dioxide

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just olya [345]

The probability is 4 out of 14

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2 years ago

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Solve the following equations;-<br><br> x - 9 /√x + 3 =1

fgiga [73]

Answer:

13 , 6.

Step-by-step explanation:

A equation is given to us and we need to find out the value of x . The given equation to us is ,

$\sf\implies \dfrac{ x -9}{\sqrt{x+3}}= 1$

Cross multiply ,

$\sf\implies x - 9 =\sqrt{ x +3}$

Squaring both sides ,

$\sf\implies (x - 9)^2 = x + 3$

Simplify the whole square ,

$\sf\implies x^2+9^2-2.9.x = x +3 \\$

$\sf\implies x^2+81 - 18x = x -3$

Add 3 and subtract x on both sides ,

$\sf\implies x^2 -18x-x +81-3=0$

Simplify ,

$\sf\implies x^2 -19x +78=0$

Split the middle term of the quadratic equation,

$\sf\implies x^2-13x-6x+78=0$

Take out common ,

$\sf\implies x( x -13)-6(x-13)=0$

Take out ( x -13 ) as common ,

$\sf\implies ( x -13)(x-6)=0$

Equate both factors to 0 ,

$\sf\implies \boxed{\pink{\sf x = 13,6}}$

<u>Hence</u><u> the</u><u> </u><u>value</u><u> of</u><u> </u><u>x</u><u> is</u><u> </u><u>1</u><u>3</u><u> </u><u>or </u><u>6</u><u> </u><u>.</u>

7 0

2 years ago

A number is decreased by seven. Then, the new number is multiplied by 3 to get an answer of -9. What is the original number? A.

rusak2 [61]

Answer:

The answer is c

Step-by-step explanation:

You have to do everything backwards,

-9 divide it by 3 to get -3, then add seven to that answer

5 0

2 years ago

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3 more than one-half of a number is 10. What is the number?

Pani-rosa [81]

Answer:

14

Step-by-step explanation:

Let's call the number x.

$\dfrac{x}{2}+3=10$

Subtract 3 from both sides:

$\dfrac{x}{2}=7$

Multiply both sides by 2:

$x=14$

Hope this helps!

3 0

3 years ago

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Gavin has nickels, dimes and quarters in a ratio of 8:1:2 if Gavin's coins are quarters, how many nickels and dimes dose gavin h

Rina8888 [55]

Answer:

34

Step-by-step explanation:

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2 years ago