MATH 211 Midterm: MATH 211 NIU 05sp Exam3

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15 Feb 2019
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You may use a calculator, but do not use books or notes. The point- value of each problem is given in the left-hand margin. Circle all of the numbers that are rational. No negative exponents should appear in your nal answer. x 2y2 y3 ! 1 (4: a) the value of a ,000 house went down by 20% the rst year and up by 20% the second year. What was its value at the end of the second year? (4: the average sat score increased from 500 to 502. By what percent had the average score gone up? (4: the price of a television has been discounted 10%. 1 x2 x x 1 x (7) 7. Solve for a in terms of b . a a + b (8) 9. How many gallons of a 20% salt solution must be added to 20 gallons of a 60% solution to make a 40% solution? (identify any symbols you introduce. ) (8) 10.