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Name: Date: Hour: MATH 8 LESSON 9.1 SQUARE ROOTS Find the square roots of the number. 16 25 18 81 20 24 Geometry – The area of a square is 49 square feet. Find the side length. Approximate the square root to the nearest integer. ___ __ 26 -√120 28 √17 30 1024 ___ √250 Use a calculator to approximate the square root. Round to the nearest tenth. ___ ___ ____ 34 -√10 36 √110 38 √1325 Evaluate the expression when a = 48 and b = 12. _______ 42 √a + b + 4 44 __________ √b2 – (a + 15) In Exercises 54-57, match the number with a point on the number line. 54 __ √15 56 __ √95 22 1600 32 ___ -√7.4 40 ____ √6.92 58 Photography – You can use the following rule of thumb when photographing fireworks: The f-stop, a number that describes the size of the opening of the camera lens, should be the number closest to the square root of the film speed. You have a camera with f-stop numbers 2.8, 4, 5.6, 8, 11, 16, and 22. Which f-stop should you use to photograph fireworks if you are using a film speed of 64? of 100? Solve the equation. Round to the nearest hundredth if necessary. 60 15 = 2h2 – 3 66 _ Consider the function y = √x. 62 1400 = 10z2 + 2 64 a) Make a table of ordered pairs (x, y) for x = 0, 1, 4, 9, 16, 25. b) Plot the ordered pairs from part (a) on a coordinate plane. c) _ Writing – Is y = √x a linear function? Explain. 1.5n2 + 7 = 20