The answer is the first one. I am pretty sure.
Circumference of a circle is found with the equation
C = 2 × pi × r
where r is the radius. So for your problem...
C = 2 × 3.14 × 4
C = 25.12 meters
That depends. If it is a fraction, can you cancel out some numbers? If it is an expression, can you combine like terms? Or do you need to factor?
Area of a triange = 180 degrees
60 + 90 + 30= 180
180-30=150
Z=150 degrees