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tester [92]
4 years ago
9

The radius of a circle is 9. Using π, which equation expresses the ratio of the circumference of the circle to the circle's diam

eter? A) C /9 = π B) C /18 = π C) C = 9π/r D) C = r /18π
Mathematics
2 answers:
Dafna1 [17]4 years ago
7 0
The formula of the circumference is C=
dsp734 years ago
4 0

Answer:

B) C÷18=π

Step-by-step explanation:

The formula of the π(pi) is :

pi(π)=Circumference(C) ÷diameter(d), where the diameter of the circle=2*radius =2*9=18

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A deck of 52 cards is shuffled. The first five cards of the deck are red. What is the probability that the last card in the deck
saveliy_v [14]

Answer:

The answer is "\frac{1}{47}".

Step-by-step explanation:

Although the five first players are red, the very first five cards are not spaded as the spad is a black card.  

Its chance of the final card mostly on deck being the ace of spades is therefore determined as:

= \frac{1}{\text{Number of remaining cards with the initial 5 cards}} \\\\= \frac{1}{47}

Thus, \frac{1}{47} here is the necessary chance.

7 0
3 years ago
A student solves the following equation and determines that the solution is −2. Is the student correct? Explain. 3 a + 2 − 6a a2
Ganezh [65]

For this case, we have the following equation (according to the comments):

\frac{3}{a+2} - \frac{6a}{a^2-4}  = \frac{1}{a-2}

First, we factor the quadratic expression in the denominator:

\frac{3}{a+2} - \frac{6a}{(a-2)(a+2)}  = \frac{1}{a-2}

Then, we multiply both sides of the equation by (a-2) (a + 2):

\frac{3(a-2)(a+2)}{a+2} - \frac{6a(a-2)(a+2)}{(a-2)(a+2)}  = \frac{(a-2)(a+2)}{a-2}

Later, canceling similar terms we have:

3(a-2) - 6a = a+2

We do distributive property on the left side of the equation:

3a-6-6a=a+2

By grouping variables and constant terms we have:

3a - 6a -a = 2+6

Rewriting we have:

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Finally, by clearing "a" we have:

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Answer:

the student correct, but the value of a= -2 is an extraneous solution

8 0
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Lana71 [14]

Answer:

The length of one of it's sides is 4

Step-by-step explanation:

4 x = 16 x 4 = 64

A cube is a 3 dimensonal square, meaning the lenght, widith, and height of the cube are all going to be teh same.

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