What is the exact value of cos 150°

-√3/2

Step-by-step explanation:

Since our angle is greater than 90, it lies in the second quadrant.

150 is obtuse angle as it is greater than 90.

We know that 150° = 180° - 30°

Also, cos(180-x) = -cos(x) because cosx is negative in the second quadrant.

cos(30) = √3/2

cos(150) = cos(180 - 30) = -cos(30) = -√3/2

OR

It can be written as:-

cos(150) = sin(90 - 150) = sin(-60) = -sin(60) = -√3/2.

to determine the unit cost your would divide the total cost by the number sold.

7 bagels for $4.41       $4.41/7 = $.63 each at fresh side

5 bagels for $3.60         $3.60/5 = $.72 each at value mart

answer: 0

step-by-step explanation: the positive, like 5, + its opposite, like -5 would be 0

5+(-5)=0, or 5-5=0