# How do you write "Twice the the quantity a number and 3."?

Dec 7, 2016

$2 \left(n + 3\right)$

#### Explanation:

a number and 3:

if the number is denoted $n$, then 'a number and 3'#
-> $' a \nu m b e r + 3 '$
-> $' n + 3 '$

to have twice this whole quantity (instead of, for instance, only n being doubled:

put $' n + 3 '$ in brackets
->$\left(n + 3\right)$

then to double it, put a 2 before the whole expression (n+3)
-> $2 \left(n + 3\right)$

the final expression: $2 \left(n + 3\right)$

Dec 7, 2016