Evaluate.[(21 - 30) - 40] - 50
A. 1
B. -39
C. -99
D. -19
Answer: C
Mathematics
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The magnitude of a star is a measure of its brightness, and it is related to the relative intensity of light reaching Earth from the star. The relationship is
Magnitude 
Relative intensity).
If relative intensity is divided by 100, how is magnitude affected?
?
A. Magnitude is decreased by 2. B. Magnitude is increased by 5. C. Magnitude is increased by 2. D. Magnitude is decreased by 5.
Mathematics
Simplify the algebraic expression.5y + 2y
A. 7y B. 3y C. 7 + y D. 10y
Mathematics
Write the system of equations for which the given matrix is the augmented matrix.  figure 1.png)
What will be an ideal response?
Mathematics
Solve.x2 + y2 = 64 x2 - y2 = 9
A. (
, 
), (-
, -
), (
, -
), (-
, 
)
B. (
, 
), (-
, -
)
C. (
, 
), (-
, -
)
D. (
, 
), (-
, -
), (
, -
), (-
, 
)
Mathematics