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Question 3 :
If $ a^2+b^2=29 $ and $ ab=10 $, then find $ a-b $. 
Question 5 :
State whether the statement is True or False.Evaluate: $(6-xy)(6+xy)$ is equal to $36-x^2y^2$.<br/>
Question 6 :
State whether the statement is True or False.Evaluate: $(7x+\dfrac{2}{3}y)(7x-\dfrac{2}{3}y)$ is equal to $49x^2-\dfrac{4}{9}y^2$.<br/>
Question 8 :
If volume and surface area of a sphere are numerically equal then it's radius is
Question 10 :
How many spherical bullets can be made out of a solid cube of lead whose edge measures 44 cm if each bullet has radius 2 cm?
Question 11 :
If the sum of the radii of two spheres is 2 km and their volumes are in the ratio 64:27 then the ratio of their radii is
