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3 years ago

Please help me (both images are together)

Mathematics

2 answers:

andreyandreev [35.5K]3 years ago

7 0

Its easy you just gotta think bro

Illusion [34]3 years ago

6 0

Answer:

Peter should join <u>Lab thinkers</u> to receive a better deal.

Science buddies costs <u>190$</u> for six months.

Lab thinkers costs <u>170$</u> for six months.

Step-by-step explanation:

The equations are...

Science buddies: 10+30x -> 10+30(6)=190

Lab thinkers: 45+25x -> 45+25(6)=170

Peter saves 20$ if he chooses lab thinkers.

Sorry for my mistake, this is my new edit.

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3 years ago

The quantity y varies directly with the square of x and inversely with z. When x is 9 and z is 27, y is 6. What is the constant

ira [324]

$\bf \qquad \qquad \textit{double proportional variation}
\\\\
\begin{array}{llll}
\textit{\underline{y} varies directly with \underline{x}}\\
\textit{and inversely with \underline{z}}
\end{array}\implies y=\cfrac{kx}{z}\impliedby 
\begin{array}{llll}
k=constant\ of\\
\qquad variation
\end{array}\\\\
-------------------------------$

$\bf \stackrel{\textit{\underline{y} varies directly with the square of \underline{x} and inversely with \underline{z}}}{y=\cfrac{kx^2}{z}}
\\\\\\
\textit{we also know that }
\begin{cases}
x=9\\
z=27\\
y=6
\end{cases}\implies 6=\cfrac{k9^2}{27}
\\\\\\
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