book Maths Puzzle Numerical Ability

i dont understand algebra i took it this year for freshmen and i dont get it i get some stuff but not alot but im not dumb my teacher just talked to fast..

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book Other Question

i need to state the value of the discriminant for the following equation of 2x squared= .7x + .o Please help - getting stuck with this absolute value problem:

2x+3>= -13