exam Maths Puzzle Numerical Ability

The problem is -(1/5)d-1=12

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Please help!

Solve the following inequalitites. Write your answers using interval notation.

a. (x+4)(2x-3)>0

b. x^2-2x<8

c. x^2+7x-18>=0

d. 3x-4/2x+1<=6

Thank you
Here are my four problems for the day...


1. Find the vertex, the line of symmetry, and the maximum or minimum value of
f(x). Graph the function.
f(x)=1/3(x+3)^2+3

2. Sim