Question 24911
are your expressions 5r and{{{r/2}}}?
If so,when r=6
5r means replace the r with 6 so you have
5 x 6 which =30.
With{{{r/2}}} this becomes{{{6/2}}}which =3.

In your next question
7x2>3m.All this means is which of the given numbers when multiplied by 3
is less than 7x2 which is equal to 14
start with m=4. 7x2>3x4 = 14>12. so we have hit on it straight away.
If m = any of the other given numbers these would make 3m bigger than 14
so m=4 is the correct answer.
Hope you understand.
Pete