exam Maths Puzzle Numerical Ability

Find the slope and y-intercept.
-2x + 3y = 21

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exam Other Question

The height ,h, in metres reached by a ball thrown into the air t seconds is given by the formula h=80+49t-4.9t^2. How long does it take the ball to reach its maximum height ? In 1990, the United States imported 917 million dollars worth of wine. In 2000, the United States imported 2209 million dollars worth of wine.

(Source: U.S. Department of Agric