Help I am failing math class

5× 1/2 = ? a) more than 5 because you are multiplying by a whole number b) 5/10 because you multiply the numerator and denominator by 5 c) less than 5 because you are multiplying by a number that is more than 1 d) less than 5 because you are multiplying by a number that is less than 1

Is the power produced directly proportional to the wind speed, give reasons for your answer?

What is the circumference of a circle with an area of 50.24 cm²?