exam Maths Puzzle Numerical Ability

i need help on this algebra problem but i dont understand 8+2(-4x-7)=35.6

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To whomever can assist, thank you...


How many years will it take $4000 to double itself if it is invested at 5% simple interest?
PLEASE PLEASE PLEASE PLEASE PLEASE HELP ME


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