exam Maths Puzzle Numerical Ability

Determine whether the following equations have a solution or not? Justify your answer
(7)1/2y2 - 6y - 13(7)1/2 = 0

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exam Other Question

The average of four numbers is 18. If one of the four numbers, 25, is taken away, what is the average of the remaining three numbers? factorize-
a-12-(root)5x-30x^
b-6(root)7^+x-5(root)7
c-21+20x^+29(root)2x
d-90x^-7(root)6x-2

plz answer these questions....thankyou!!!