exam Maths Puzzle Numerical Ability

What values of b will make x^2 + bx + 2/5 a perfect square trinomial ?

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exam Other Question

At 9 am a truck leaves the truck yard and travels west at a rate of 50 mph. Two hours later, a second truck leaves along the same route, travelling at 75 mph. When will the second truck catch up to the first?

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Find a linear functon g given g(-1/4)= -6 and g(2)=3

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