Answer:
see below
Step-by-step explanation:
• find x
use tan rule
tan( 60 degrees) = x / 7
tan ( 60 ) x 7 = 12 . 1
x = 12. 1
• find y
you can either use Pythagoras theorem or the sin rule
let's use sin
sin ( 30 ) = 7 / y
y = 14.0
hope this helps, please mark it
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Answer:
99
Step-by-step explanation:
Through some clever algebra, we can combine our first two equations using the fact that
We have the a² and the b² in the equation 
, and we <em>almost </em>have a 2ab in the equation 
. To get that 2ab, we can simply double both sides of the first equation to get 
. From there, we'll add the first two equations together, giving us the summed equation
And since , we can equivalently say that
