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2 years ago

Probability math help! Please help :)

Mathematics

1 answer:

sukhopar [10]2 years ago

7 0

Answer:

20%

Step-by-step explanation:

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9 pencils cost $7.74.Which equation would help determine the cost of 6 pencils?

Dima020 [189]

Answer:

The equation is x= (7.74 /9) 6

Step-by-step explanation:

Hi, to answer this question we have to analyze the information given:

If 9 pencils cost $7.74, we have to divide the total cost ($7.74) by the number of pencils (9) to obtain the price of 1 pencil.

Now that we have the price of 1 pencil, to obtain the cost of 6 of them we simply multiply the result by six.

Mathematically speaking:

x= (7.74 /9) 6

Where:

x = Cost of 6 pencils in $

Solving:

x = 0.86 x 6 = $5.16

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2 years ago

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Mrs. Pahulick went to Super Buy to purchase the iPhone 12, which is typically $999.99. For one day only, it is on sale at a 15%

lana [24]

Answer:

$900.10

Step-by-step explanation:

15 percent of 999.99 = $849.15

(999 x 15)/100 = $149.85

849.15 with 6 percent sales tax is 900.10

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2 years ago

25 is a perfect square. Which of the following is a perfect cube?

Karolina [17]

Answer:

the perfect cube is [A] 1

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2 years ago

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the pitch, or frequency, of a vibrating string varies directly with the square root of the tension. if a string vibrates at a fr

Naily [24]

$\bf \qquad \qquad \textit{direct proportional variation}\\\\
\textit{\underline{y} varies directly with \underline{x}}\qquad \qquad y=kx\impliedby 
\begin{array}{llll}
k=constant\ of\\
\qquad variation
\end{array}\\\\
-------------------------------\\\\
\begin{array}{llll}
\stackrel{frequency}{f}\textit{ of a vibrating string varies directly}\\
\qquad \qquad \textit{with the square root of the tension }\stackrel{tension}{t}
\end{array}$

$\bf f=k\sqrt{t}\quad \textit{we also know that }
\begin{cases}
f=300\\
t=8
\end{cases}\implies 300=k\sqrt{8}
\\\\\\
\cfrac{300}{\sqrt{8}}=k\implies \cfrac{300}{\sqrt{2^2\cdot 2}}=k\implies \cfrac{300}{2\sqrt{2}}=k\implies \cfrac{150}{\sqrt{2}}=k
\\\\\\
\textit{and we can \underline{rationalize} it to }\cfrac{150\sqrt{2}}{2}\implies 75\sqrt{2}=k$

$\bf thus\qquad f=\stackrel{k}{75\sqrt{2}}\sqrt{t}\implies \boxed{f=75\sqrt{2t}}\\\\
-------------------------------\\\\
\textit{now, when t = 72, what is \underline{f}?}\qquad f=75\sqrt{2(72)}$

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(x+y)×(x+y) tell me the answer

lys-0071 [83]

The answer is x2 + 2xy + y2.

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3 years ago

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