Can i get help please
2 answers:
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The yardstick and its shadow form a right triangle that is similar to the right triangle formed by the telephone pole and its shadow, where the objects and their shadows correspond to one another, respectively.
This means there is some scale factor
such that 
where 
is the height of the telephone pole. (The 3 comes from the fact that you're using a yardstick, which is 3 feet long.)
Set up a proportion relation:
which means the telephone has a height of 12 ft 7 in.
This means there is some scale factor
Set up a proportion relation:
which means the telephone has a height of 12 ft 7 in.