I need help #7 The tide at a boat dock can be modeled by the equation y = -2 cos ( +8, +8, where tis the number of hours past noon and y is the height of the tide, in feet. For how many hours between $ = 0 and I = 12 is the tide at least 7 feet? [The use of the grid is optional) ​

-3 degrees

step-by-step explanation:

any of them that add up to 180 degrees.

perimeter = 10 +  √10  units

explanation:

first, we will need to get the length of each line using the distance formula which is as follows:

distance = 

1- length of ab:

ab =   = 5 units

2- length of ac

length of ac is the same as ab = 5 units

3- length of bc:

bc =   =  √10  units

now, we can get the perimeter by adding the side lengths as follows:

perimeter = 5 + 5 +  √10

perimeter = 10 +  √10  units

hope this : )

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