book
Maths Puzzle
Numerical Ability
factor completely
20y^2n - y^n - 12
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book Other Question
(1) find the exact value of sec(225degrees)
(2) In the triangle ABC, find A, if B= 100 degrees, and a=20.
(3) In the triangle ABC, find b, iF A=15, C=12 and angle b=150 degrees.
i really really need help on solving 15= -3 (x-1) +9 thanks alot!