exam Maths Puzzle Numerical Ability

I'm just having promblems on a WKST from this lessong but example 3 show on chapter 4 what it sorta contributes to the same thing but its more:
(7x-6)
and then triangle with othe

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exam Other Question

find the value of m for which the curve y=8mx^2+3mx+1 touches the x-axis. Business and finance. The cost of producing a number ofitems x is given by C=mx+b, in which b is the fixed cost andm is the variable cost (the cost of producingone more item).
(a