Can someone pretty me solve 1) a & b?

What is the length of the missing leg in this right triangle? 18 mm 24 mm 26 mm 32 mm

This is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 5 terms.

Find the rate at which the water is now flowing from the tap give your answer cubic centimetres per second