7.) (x, y) —> (1/2*x, 1/2*y)
By induction:
It's true for

, since

clearly contains a factor of 3.
Suppose it's true for

, that

is divisible by 3. Then

where

is an integer. This reduces to

and both terms are clearly multiples of 3. We know that

is an integer since we had set

previously, which implies

is a multiple of

. So the statement is true.
Answer:
x = 14 cm
Step-by-step explanation:
200 000 cm = 2 km
1 cm ............... 2km
x cm ..............28 km
x = 28*1/2 = 28/2 = 14 cm
Answer:

Step-by-step explanation:
Given : 
In order to find
we will substitute
for
in the given function, that is :

