exam Maths Puzzle Numerical Ability

A cliff diver in Acapulco, Mexico, dives from about 17m above the water. The diver's height above the water h, in metres, after t seconds is modelled by
h= -4.9t squared + 1.5t +

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i need to Graph using the intercept method: 2x - 5y = 10. please show me how to graph this! Several students decide to start a T-shirt company. After initial expenses of $280, they purchase each T-shirt for $3.99. They sell each T-shirt for $10.99. How many must they sell to break even?