Suppose a rock is thrown off of a bridge into the river 120 feet below. the height, h, in feet of the rock above the river is given by h = −16t2 + 84t + 120, where t is the time in seconds. how long does it take the rock to splash into the river below?

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

Solve the equation using the zero-product property. -3n(7n - 5) = 0 a. 0, -5/7 b. -1/3, -5/7 c. -1/3, 5/7 d. 0, 5/7

Me its important ! marge runs an ice cream parlor. her speciality is triple chocolate sundaes.she can prepare 1 sundae every 2 minutes, and she earns $1.20 for each sundae she makes . if she just makes sundaes for a single shift of at most 4 hours and at least 2 hours , which function relates her earnings to the number of minutes she works?