book Maths Puzzle Numerical Ability

x^2-19x+90=0
Solve by using quadratic formula

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book Other Question

My question says to solve the equation and check the solution.
7= square root of 2x+3

Could you help me with this? thanks! Let 'n' be the number of shirts produced by Company ABC, and let 'p' be the price for a shirt. From past data, these two variables are related in the following way: p= -0.003n+20.