Translate each of these situations into a variable expression such as those found in a magic number chart.

1. Pick a number and multiply it by $7$.

   Hint (a):

   Use x to represent the number you pick.

   More Help (a):

   What would the expression look like if you multiplied your number by $7$?

   Answer (a):

   $7x$

2. Pick a number and divide it by $8$.

   Hint (b):

   See (a).

3. Pick a number and reduce it by $10$.

   Hint (c):

   What happens to a number when you reduce it by $10$?

   More Help (c):

   See part (a).

4. Pick a number, add $2$, then multiply by $5$.

   Hint (d):

   See part (a).

   Answer (d):

   $5 ( x + 2 )$