Answer:
11.6cm
Step-by-step explanation:
a^2+b^2=c^2
11^2+b^2=16^2
121+b^2=256
b^2=135
b=11.6
You FOIL
9x^2-15x+21x-35
Combine like terms
9x^2 + 6x - 35
How are we supposed to draw a diagram for you? do you want me to explain to you how to answer the question?