exam Maths Puzzle Numerical Ability

please provide the simplified results

5x - 5y � 5x - 10y
x2 + 6xy - 16y2 x2 + 10xy + 16y2

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exam Other Question

Solve the rational equation

b+3/b + b+4/b+5 = 15/b^2+5b must determine the volume of a 250mL beaker on two different ways.
Height= 9.03 cm
Diameter=6.73
Raduis= 3.37
use equation V=pieh to calulate the volume in cubic centimeter