# SOLUTION: 4.) If sin(2theta + 18) = cos(5theta - 12), which of the follwoing pairs of angles are represented in this equation? (a)42, 48 degrees (b)38, 52 degrees (c) 12, 6

Algebra ->  Algebra  -> Functions -> SOLUTION: 4.) If sin(2theta + 18) = cos(5theta - 12), which of the follwoing pairs of angles are represented in this equation? (a)42, 48 degrees (b)38, 52 degrees (c) 12, 6      Log On

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 Question 174626This question is from textbook Amsco's Preparing for the Regents Examination Mathematics B : 4.) If sin(2theta + 18) = cos(5theta - 12), which of the follwoing pairs of angles are represented in this equation? (a)42, 48 degrees (b)38, 52 degrees (c) 12, 68 degrees (d) 45, 45 degrees 5) Crossing a wooden bridge at Letchworth Park, Melissa drops a penny into the water below for good luck. If the height of the penny is modeled by the function h(t)=64 - 16t^2, where t represents time in seconds and h(t) is height in feet, how many seconds did it take the penny to hit the water? (a) 1 (b) 2 (c) 3 (d) 4 Sh0w work thanks so much! This question is from textbook Amsco's Preparing for the Regents Examination Mathematics B Answer by nycsub_teacher(90)   (Show Source): You can put this solution on YOUR website!5) Crossing a wooden bridge at Letchworth Park, Melissa drops a penny into the water below for good luck. If the height of the penny is modeled by the function h(t)=64 - 16t^2, where t represents time in seconds and h(t) is height in feet, how many seconds did it take the penny to hit the water? (a) 1 (b) 2 (c) 3 (d) 4 =================================================================== Let h(t) = 0 0 = 64 - 16t^2 All you have to do is solve for t. Can you take it from here? ================================== Hello. I received your e-mail. You need more help, right? Here is one of your questions: (5) Crossing a wooden bridge at Letchworth Park, Melissa drops a penny into the water below for good luck. If the height of the penny is modeled by the function h(t)=64 - 16t^2, where t represents time in seconds and h(t) is height in feet, how many seconds did it take the penny to hit the water? (a) 1 (b) 2 (c) 3 (d) 4 Let h(t) = 0 0 = 64 - 16t^2 Subtract 64 from both sides. -64 = -16t^2 Now divide both sides by -16. -64/-16 = t^2 64/16 = t^2 4 = t^2 Finally take the square root of both sides of the equation. sqrt{4} = sqrt{t^2} 2 = t The answer is choice (b). Do you need help with the trig equation question? Happy new year!