Question

Q7. The volume of a cylinder is also equal to area of -------X
Q8. If (x-y)=20 and xy= 15 then (x²+y?) =
09. If (x²-y?)=481 and x-y=13,then x+y=-----
Q10. If (a+b) = 19 and (a-b)=5,then (a²-b)=​

Answer 1

Step-by-step explanation:

7.) The question is not clear to me

8.) x² + y² = (x-y)² + 2xy = 20² + 2×15 = 400+30 = 430

9.) x²-y² = 481

=> (x+y)(x-y) = 481

=> x+y = 481/13 = 37

10.) a²-b² = (a+b)(a-b) = 19×5 = 95