1. c (multiply by 3 to get 9x - 3y = 15)
2. c (add the new top expression with the bottom one to get 11x = 0) substitute 0 into either equation to get -5)
hope this helps!
72 days equals 24×72=1728 hours plus 16= 1744 plus 30 minutes is 1744.50
Coterminal angles are found by adding/subtracting 2

or 360, so D.
Given:
Consider the expression is

To find:
The value of given expression using a suitable identity.
Solution:
We have,

Using the identity
, we get



Therefore, the value of the given expression is
.
The mode is 7.
Mode means most and 7 hours of sleep is the most frequent.