Step-by-step explanation:
(x + y , x - y) = (4 , 2)
x+y=4 ------(1)
x-y=2 ------(2)
_____ (adding two equation)
2x=6
x=3
From equation 1
3+y=4
y=1
The answer is A (THERE ARE NO SOLUTIONS).
Your work on 'd' is correct, and your answer is correct.
'f' has been answered where you posted it as a separate question.
The value square root of 3 is a value of a special triangle measuring 30-60-90. In this case, we are familiar <span>that the sin of 60 degrees is equal to square root of 3 over 2. and that the cosine of 60 degrees 0.5. tangent is sine over cosine, hence square root of 3 is equivalent. In this case, the answer should be 60 degrees. The negative and positive value inside the parenthesis is the same. </span>