Answer:
(3h+18) = (15h)
3h +18 = 15h
subtracting 3h from both sides
=> 3h + 18 - 3h = 15h - 3h
=> 18 = 12h
Dividing by 12 both sides
=> 18/12 = 12h/12
=> 3/2 = h
=> 1.5 = h
=> h = 1.5
h = 1.5
h = 1.5 if (3h+18) = (15h)
or
3h + 18 + 15h = 180
=> 18h + 18 = 180
Dividing by 18 both sides
=> h + 1 = 10
=> h = 9
Remember that D is just an unknown number "5 more than" means add 5 onto a number. 8 is "5 more than 3", 20 is 5 more than 15. "5 more than d is" d+5
False; 2 is obviously divisible by 2, but cannot be divided by 4.
In the sequence of even positive integers {2, 4, 6, 8, 10, 12, …}, the set containing every other even number is also a counterexample:
{2, 6, 10, 14, 18, …}