If 7 cans of spinach soup cost $49, how much do 10 cans cost?

Mathematics

2 answers:

vekshin13 years ago

7 0

Divide 49 by 7 to find what one can cost then multiply by 10 to find the answer

Leni [432]3 years ago

4 0

Take 49 and divide it by 7 and you get 7. 7 times 10 is 70. Your answer is $70.

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Find a quadratic equation with roots -1, 4i and -1 - 4i

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$\bf \textit{difference of squares}
\\\\
(a-b)(a+b) = a^2-b^2\qquad \qquad 
a^2-b^2 = (a-b)(a+b)
\\\\\\
\textit{also recall that }i^2=-1\\\\
-------------------------------\\\\
\begin{cases}
x=-1+4i\implies &x+1-4i=0\\
x=-1-4i\implies &x+1+4i=0
\end{cases}
\\\\\\
(x+1-4i)(x+1+4i)=\stackrel{y}{0}
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[(x+1)~~-~~(4i)][(x+1)~~+~~(4i)]=y
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