f.1 mathematics

Simplify the following expressions.

(7-h)-(3+h)-(2h+1)
=7-h-3-h-2h-1
=(7-3-1)-(h+h+2h)
=3-4h

If n is an even number, what is the sum of the next three even numbers after n?

The first next even no.: n+2
The second next even no.: n+4
The third next even no.: n+6
The sum of three next even no.: n+2+n+4+n+6
=3n+12

p.8

b) (7-h)-(3+h)-(2h+1)

=7-h-3-h-2h-1

=3-4h

p.10

6.) next three even numbers :
n+2
n+4
n+6