draw and recognise the noninverting opamp amplifier circuit and describe its applications;
use the formula V_{out} = 1 + R_{f}
V_{in} R_{in}
recall that the input resistance is equal to that of the opamp;
Notice that:
Why can we say that the voltage at P is V_{in}? 
What is the gain of a noninverting amplifier with a feedback resistor of 10000 ohms and R_{a} value of 100 ohms? 
Links 

Radioelectronics circuits for opamps 

ElectronicsTutorials 

Technology Student on opamps 

Video tutorial 