Answer:
90 approximately because if AB is 80 then DC should be 90 because AB come before DC in letters
Cos x=5/12. Solve for x which is 65.37 degrees.
Answer:
1 ) a 2) b 3) d 4) b 5) a 6) c
Step-by-step explanation:
Answer:

Step-by-step explanation:
Taking the succession:

You can multiply and divide by 1-r without chaging the result:

Distributing the upper part of the fraction you have:

As can be seen all the intermediate members will be canceled by a same member with opposite sign, only
will be left so:
