For a certain model of car the distance d required to stop the vehicle if it is traveling at v mi/h is given by the formula d = v + v2/20     where d is measured in feet. Kerry wants her stopping distance not to exceed 40 ft. At what range of speeds (in mi/h) can she travel? (Enter your answer using interval notation.)   2: Determine the values of the variable for which the expression is defined as a real number. (Enter your answer using interval notation.)   x2 − 2x − 80

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A: a)y÷4=6 R 3 R-Remainder y4=6 R 3y=4(6) R 3y=24 + 3y=27

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