Rewrite the fractions as equivalent fractions with the LCD.
and 
; 30
A. 
and 
B. 
and 
C. 
and 
D. 
and 
Answer: C
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Use the pH scale to answer the question.If the pH of a solution decreases by 1.7, how much does the hydrogen ion concentration change? Does the change make the solution more acidic or more basic?
A. Increases by a factor of 17; more acidic B. Decreases by a factor of 50; more basic C. Decreases by a factor of 17; more basic D. Increases by a factor of 50; more acidic
Solve the system by the addition method.x2 + y2 - 4x - 2y - 31 = 0 x2 - y2 - 4x + 2y - 33 = 0
A. {(2, 7), (2, -5)} B. {(8, 1), (4, 1)} C. {(8, 1), (-4, 1)} D. {(2, -7), (2, 5)}
Solve the problem.A pendulum bob swings through an arc 40 inches long on its first swing. Each swing thereafter, it swings only 63% as far as on the previous swing. What is the length of the arc after 9 swings? Round your answer to two decimal places, if necessary.
A. 201.6 inches B. 0.39 inches C. 0.99 inches D. 0.63 inches
Perform the indicated operation. Write the result in the form a + bi.(8 + 8i) - (-6 + i)
A. -14 - 7i B. 14 - 7i C. 14 + 7i D. 2 + 9i