Question

Need help, show working please.

Answer 1

i can't remember... doesn't that backslash in #3 mean to exclude the set?

Answer 2

\ is inclusive

Answer 3

for 6a

R+ means I think you just draw a line going from 0 to 5

and for the second part

the interval goes from negative infinity upto 0 (inclusive)

at the ends of the line you draw a open circle to show that the number is not inclusive, or shaded circle to show that it is