Idon't have a clue
solve for x, 0° ≤ x ≤ 360°. write degree measurements in ascending order.

cos 2 x+cos²x=1 x =

First of all, we can use the double angle identity to write

The equation becomes

Divide both sides by 3 to get

And finally consider the square root of both terms (don't forget the double sign):

So, the solutions are

If you want x in [0,360], consider the equivalent angle

d

step-by-step explanation:

9 sandwiches per hour

step-by-step explanation:

when we have a rate, we want a 1 in the denominator

27/3 = 9

27 sandwiches/ 3 hours = 9 sandwiches/hour