Alex laughed a ball into air the height of the ball can be represented by the equation h=-8t +40t+5, where h is the height in units, and t is the time ,in seconds, after the ball was launched. graph the equation frim t=0 to t=5 seconds.

For this case the correct equation should be:
 h = -8t ^ 2 + 40t + 5
 We observe that we have a parabola.
 The direction of the parabola is opening downwards. This is because the coefficient of the quadratic term is negative.
 We must graph the function in the following domain:
 [0, 5]
 
 see attached image

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.