Answer: 
Step-by-step explanation:
Given
Fractions are
and 
LCD of the two fractions is the least common denominator

Thus, option (c) is correct.
The answer is 250 for this question
Answer:5 units
Step-by-step explanation:
Area(a)=30
Base(b)=12
Height(h)=?
Area of =(base(b) x height(h))/2
30=(12 x h)/2
Cross product
30 x 2=12 x h
60=12h
Divide both sides by 12
60/12=12h/h
5=h
Therefore height(h)=5units
The formula for volume of a hemisphere is,
2/3 * pi * r^3.
So by substituting the value of ‘r’ you can find it..
Hope it helps.....