If 90 degrees < theta < 180 degrees, and cos theta = 5/7, what is the cos (-theta)?

I don’t have the mathematical inserts so degrees and theta would of course be used with their actual sign. Thank you in advanced

Figure abcde is a regular pentagon. segment ae is located at a (2, 1) and e (4, 1). what is the perimeter of abcde? 4 units 6 units 8 units 10 units

Koji is installing a rectangular window in an office building. the window is 823 feet wide and 534 feet high. the formula for the area of a rectangle is a=bh. what is the area of the window? enter your answer as a mixed number in simplest form in the box. $$ ft2

Which will form a composite function?