Cos b = 1/2[sin(a+b) + sin (a - b)]
O A. sina
B. sinb
C. cosb
D. cosa

Which equation can be used to solve for the unknown number? seven less than a number is thirteen. n-7=13 7-n=13 n+7=13 n+13=7

Scale factor of 2 is used to enlarge a figure as shown below the area of is 18 in.²

Kelly is a salesperson at a shoe store, where she must sell a pre-set number of pairs of shoes each month. at the end of each work day the number of pairs of shoes that she has left to sell that month is given by the equation s=300-15x , where s is the number of pair of shoes kelly still needs to sell and x is the number of days she has worked that month. what is the meaning of the number 300 in this equation