Answer:
Step-by-step explanation:
Supplementary angles add up to 180°.
If the angle is x, its supplement is 180°-x.
x = (180°-x) - 78°
x = 51°
supplement = 180°-x = 129°
The angles are 51° and 129°
Answer:

Step-by-step explanation:
Given matrix is,

Operations performed,
-10R₂ → R₂

3R₃ → R₃

Answer:
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Step-by-step explanation:
Answer:
B
Step-by-step explanation:
f(x) = y = x^2 + 7
x = y^2 + 7
x - 7 = y^2
sqrt(y^2) = sqrt(x - 7)
y = +/- (x - 7)
Answer B