book Maths Puzzle Numerical Ability

Sec a- Cos a/ Tan a = Sin a

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book Other Question

factor the quadratic expression completely, and find the roots of the expression.

135x^2 - 222x + 91 A ten-gallon aquarium is 3 inches higher than it is wide. Its length is 21 inches., and its volume is 2730 inches cubed. What are the height and width of the aquarium?