4./3
find the sine and the cosine of 309,

sin(309) = 0.902 cos(309) = 0.432

Explanation:

We can find the nearest possible value and can approximate them for our answer.

now, nearest value possible can be considered 307 in case of 309 angle as 307 can be written as 360-53

and we know the values of sin(360) , cos (360) and sin(53) , cos (53) and the formula to be used is

sin(A-B) = sinAcosB - cosAsinB and

cos(A-B) = cosAcosB + sinAsinB.

Taking A as 360 and B as 53

and substituting values, we get ,

sin(A-B) = (3/5)*0.9 - 1*4/5 = approx 0.902 for sin(309) and

cos(A-B) = 1*3/5 + 4/5*0.9 = approx 0.432 for cos(309).

the answer is c. hope this !

step-by-step explanation:

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