exam Maths Puzzle Numerical Ability

Solve the following quadratic equations by using quadratic formula.

2.1y^2-3.5y=4

a(a+2)=-1

6x^2+5x-4=3x-2

4x^2-14x-27=3

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exam Other Question
Hoe many pounds of hamburger that costs 1.60 per pound must be mixed with 70 pounds of hamburger that costs 2.10 per pound to make a mixture that costs 1.70 per pound. Graph the inequality (in an (x,y) coordinate system)

x equal to or less than 4

Thank you.