Leslie says that 5 multiplied by an even number always results in an even product. is leslie's statement correct?

Yes.  If you think about it, 5 multiplied by an odd number will always produce a number with the last digit 5.  5 multiplied by an even number will always result in a number with the last digit 0.  Since a number ending in 0 is even, Leslie's statement is correct.

Yeah cuz 5,10,15,20,25,30 it continues with even numbers at the end

The answer is 41.7 because 1.39 times 30 is 41.7

than do 23.50 times 18 and then divide your answer by 100 than you will get x.