exam Maths Puzzle Numerical Ability

I have to solve using the quadric formula and if there are no real roots say so...Can you please help me? Thanks...:)

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Number 14

3 = 7x - 4x^2

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exam Other Question

The volume of a cube is given by V = s^3. Find the length of a side of a cube if the Volume is 729 cm^3. "^" Means it is cubed
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Show work in this space. in a bridge club, there are three more women than men. how many people are members of the club if the probability that a member chosen at random, is a woman is 3/5?