book Maths Puzzle Numerical Ability

"What is the meaning of open sentences"

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book Other Question

I am 50 years old and I am taking a online math course online and i cannot figure out this with the fractions in it:
Solve each inequality. Give the solution set in both interval and graph forms.

7/5(10z-1)<2/3(6z+5) how do you prove the quadratic formula of
y=ax^2+bx+c