book Maths Puzzle Numerical Ability

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

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book Other Question

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 -6x+9>3

what does the graph look like for this?