The bottom of a ladder is on horizontal ground. The top of the ladder is leaning against a vertical wall.
h metres
d metres
The angle between the ladder and the ground is zº.
Some safety instructions say it is safe to climb the ladder when
h = 4d
(a) Work out the value of 2 when h = 4d
(3 marks)

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?