exam Maths Puzzle Numerical Ability

Use three or more sentences to describe how you would solve the following equation using the quadratic formula. 2x2-13x-7=0

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-6.98+0.475=; 7.2-9.03=; -6+-2.17=; -0.01- -1.1=; 4+-0.008=; -1.808-180.8=; -0.003+-7=; 50001-0.999=; -0.6+-6+-0.06=; 12-0.076+-8.8=; -0.7+0.02-3=;
-0.05- -5-0.005= Find the cost per pound of a coffee mixtur made from 7 lbs of coffee that costs $9.80 per lb and 3lbs of coffee that costa $8.10 per lb?