3-4 No 5-7 Yes
Explanation:
If you substitute each number in for z and multiply by the coefficient, 8, you’ll find that 8*3=24, 8*4=32 which are both less than 40, not greater than or equal to as is asked for. On the other hand, you have 8*5=40, 8*6=48 and 8*7=56, all either equal to or greater than 40.
