Use a system of linear equations to solve the problem.Two angles are supplementary if the sum of their measures is 180°. The measure of the first angle is 48° more than four times the second angle. Find the measure of each angle.
A. first angle = 2.4°, second angle = 177.6°
B. first angle = 153.6°, second angle = 26.4°
C. first angle = 177.6°, second angle = 2.4°
D. first angle = 26.4°, second angle = 153.6°
Answer: B
Mathematics
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Graph the polar equation.r = 
A. 
B. 
C. 
D. 
Mathematics
Solve.The hydrogen ion concentration of a substance is about 5.4 × 10-2 moles per liter. Find the pH. Round to the nearest tenth. Use the formula pH = -log [H+].
A. 1.3 B. 1.6 C. -2.7 D. 2.7
Mathematics
Evaluate the expression.
A. -25
B. 
C. 25
D. 
Mathematics
Write a numerical expression for the phrase and simplify it.Five-ninths of the difference between -7 and -25.
A. 
+ [(-7) - (-25)]; 30
B. 5(9) [(-7) - (-25)]; 10
C. 5(9) [(-7) - (-25)]; 810
D. 
[(-7) - (-25)]; 10
Mathematics