exam Maths Puzzle Numerical Ability

Graph f(x) = 3x + 2

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In planning for a new item, a manufacturer assumes that the number of items produced x and the cost in dollars C of producing these ites are related by a linear equation. Projectio If I increase my usual driving speed by 10 km/h, I can drive the 255 km to Nashviille in 24 minutes less than usual. How fast do I usually drive?