Answer:
$420
Step-by-step explanation:
Answer:
10y-30
Step-by-step explanation:
10*1y=10y
-3*10=-30
10y-30
Answer: 
<u>Step-by-step explanation:</u>
Note the following identities: tan² x = sec²x - 1

tan² x + sec x = 1
(sec² x -1) + sec x = 1
sec² x + sec x - 2 = 0
(sec x + 2)(sec x - 1) = 0
sec x + 2 = 0 sec x - 1 = 0
sec x = -2 sec x = 1

Answer:
Not a solution
Step-by-step explanation:
In order for
to be a solution, the result after substituting must be 0:




Therefore,
is not a solution to 