exam Maths Puzzle Numerical Ability

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1. Consider the graph of y = tan x.
(a) How does it show that the tangent of 90 degrees is undefined?
(b) What are other undefin

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i need help on this algebra problem but i dont understand 8+2(-4x-7)=35.6 x(5.5-1.1)-(3.7 x 5)=120
how do i solve for x?