2 years ago

What is the surface area of a sphere with radius 3?

1 answer:

7 0

The surface area is 113 but since that’s not an option I’m assuming you need the answer in terms of pi which would be 37

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grin007 [14]

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2 years ago

HELP FAST PLEASE<br> Find u*v, if u=13j and v=i+3j

Flauer [41]

$\bf \begin{cases}
u=13j\implies 0i+13j\implies \ \textless \ 0,13\ \textgreater \ \\
v=i+3j\implies 1i+3j\implies \ \textless \ 1,3\ \textgreater \ 
\end{cases}
\\\\\\
\ \textless \ 0,13\ \textgreater \ \cdot \ \textless \ 1,3\ \textgreater \ \implies (0\cdot 1)+(13\cdot 3)\implies 39$