4 years ago

How many ways can a committee of three people be selected from a group of 20?

Mathematics

1 answer:

Rainbow [258]4 years ago

7 0

Answer:

120

Step-by-step explanation:

From 20, choose 3:

₂₀C₃ = 120

Here we use combinations instead of permutations because the order doesn't matter.

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Please help me with this math problem!!!!!

vagabundo [1.1K]

Answer:

Step-by-step explanation:

$\cos ~A=0.5=cos~60 \\A=60^\circ\\B=180-A=180-60=120\\\angle~B=120^\circ$

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3 years ago

Suppose that x=6 and y=8. If y is inversely related to x, what is y when x=3?

andrey2020 [161]

$\bf \qquad \qquad \textit{inverse proportional variation}\\\\
\textit{\underline{y} varies inversely with \underline{x}}\qquad \qquad y=\cfrac{k}{x}\impliedby 
\begin{array}{llll}
k=constant\ of\\
\qquad variation
\end{array}\\\\
-------------------------------\\\\
\textit{we also know that }
\begin{cases}
x=6\\
y=8
\end{cases}\implies 8=\cfrac{k}{6}\implies 48=k
\\\\\\
therefore\qquad \boxed{y=\cfrac{48}{x}}
\\\\\\
\textit{when x = 3, what is \underline{y}?}\qquad y=\cfrac{48}{3}$