कैसे हल करें A biologist assumes that there is a linear relationship between the amount of fertilizer supplied to tomato plants and the subsequent yield of tomatoes obtained. Eight tomato plants, of the same variety, were selected at random and treated, weekly, with a solution in which x grams of fertilizer was dissolved in a fixed quantity of water. The yield, y kilograms, of tomatoes was recorded. PlantABDE F GH 1.01.52.02.5 3.03.5 4.04.5 y 3.9 4.45.86.67.07.17.37.7 (a) Plot a scatter diagram of yield, y, against amount of fertilizer, x. (b) Calculate the equation of the least squares regression line of y on x. (c) Estimate the yield of a plant treated, weekly, with 3.2 grams of fertilizer. (d) Indicate why it may not be appropriate to use your equation to predict the yield of a plant treated, weekly, with 20 grams of fertilizer.

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1. Factor the equation (x + 2)(x + 3) = 0. 2. Set each factor equal to zero: x + 2 = 0 and x + 3 = 0. 3. Solve for x: x = -2 and x = -3.

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