exam Maths Puzzle Numerical Ability

Please can you help me with this one?

The base of a 30-foot ladder is 10 feet from a building. If the ladder reaches the flat roof, how tall is the building?

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exam Other Question
Find the sum of the first thirty terms of the following arithmetic series:
16+25+34+43... 3(x-2)+2=2(x-4)

-7x=-26+6x

7x+3>9x-5

I=Prt solve for r

This is from Beginning Algebra by John Tobey, Jeffrey Slater
6th edition