exam Maths Puzzle Numerical Ability

The sun is 5.2 AU. If the average radius of the orbit of Venus is 0.723 AU, then how many years does it take for Venus to complet one orbit of the sun?

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Hi! I need to calculate the discriminant and state how many real solutions each equation has.

4x^2-6x+4=0
and
4x^2-4x+1=0

Thanks for youe help in advance! Find the value of t.

The midpoint of the segment joining (t,2) and (3t, -4) is (-6,-1).