Explain how to use a number line to find the difference of -6 - (-2 1/2)

Start at the number that is being subtracted, in this case it's -6.  When a negative number is subtracted from a negative number, the two are added.  Therefore, move left from -6 on the number to add on the -2 1/2, which should lead you to -8 1/2 (if you do it right lol :) )

boom :)

b) 1/3 * 1/5

step-by-step explanation:

each smallest part is 1/15 since the written one is 1/5 and it's divided by 3 equal parts. (1/5 )/3 = 1/15 = 1/3 * 1/5