The most proper way to write

  $5\times y\times x$ 

is: 

The most proper way to write

 $b\times3\times a\times2$  

is: 

Taym has 3 boxes of marbles and 2 marbles in his hand.

Which of the following is a good expression for the number of marbles Taym has?

Layan eats 3 meals a day. If she is going for an $n$  days tour, how many meals would she need? 

The most proper way to write

 $2\times x\times x\times x$ 

is: 

 

Sama is 3 years younger than her brother. If her brother is

 $m$  years old,

 which of the following expression represents her age?

Sama is 3 years younger than her brother. If her brother is

 $m$   years old,

 which of the following expression represents the SUM of their ages?