book Maths Puzzle Numerical Ability

The cost to run Machine 1 for an hour is $2. During that hour, Machine 1 produces 240 bolts and 100 nuts. The cost to run machine 2 for an hour is $2.40. Durin that hour, Machine 2

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Algebraic expression for the problem {{{bx^2+bx+a^2}}} they differby the sign of the square root. What is the answer for the one with a plus sign? Factoring out Monomials PLEASE HELP I DONT UNDERSTAND BECAUSE HOW CAN I FIND THE ANSWERS WITHOUT ANY INFORMATION TO GIVE ME A CLUE AS TO WHAT THEIR AGES ARE?
Mr. Jones says that h