exam Maths Puzzle Numerical Ability

what is the solution to (b-15)

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exam Other Question

How do i write the expression as single quotient in which only positive exponents and or radical appear?

(x^2+4)^.5(2x)-(x^2)(.5)(x^2+4)^-.5(2x)/(x^2+4)
A circle whose equation is (x+5)^2+(y+3)^2 is stretched by a factor of 1/4. What is the new equation?