How to calculate sin, cos and tan
SOH CAH TOA (imagining each as a triangle)
S = sin
C = cos
T = tan
O = opposite
H = hypotenuse
A = adjacent
PH
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How to expand and simplify expressions
Simplify : 4(x+5) / x^2+2x-15
15 machines work at the same rate, 15 machines can complete an order in 8 hours, however 3 of the machines break down after 6 hours. The other machines continue until the order is complete. In total how many hours does EACH machine work? (3 mark question)