Solve the problem.The hydrogen potential, pH, of a substance is defined by pH = -log [H+], where [H+] is measured in moles per liter. Find the pH of a sample of lake water whose [H+] is 3.05 × 10-9 moles per liter. (Round to the nearest tenth.)
A. 10.1
B. 7.3
C. 6.4
D. 8.5
Answer: D
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Solve the inequality and express the solution set in interval notation. Graph the solution set on the real number line.11 - 3(3 - x) ? 8
A. x ? 3; (-?, 3]
B. x ? 2; [2, ?)
C. x ? 2; (-?, 2]
D. x < 2; (-?, 2)
Solve the problem.An object is propelled vertically upward from the top of a 304-foot building. The quadratic function 
models the ball's height above the ground, 
in feet, t seconds after it was thrown. How many seconds does it take until the object finally hits the ground? Round to the nearest tenth of a second if necessary.
A. 2 seconds B. 10.8 seconds C. 1.8 seconds D. 4.5 seconds
Solve the equation using an integrating factor.y' + t2y = 4t2, t > 0
A. y = 4x + Ce-t2/2 B. y = 4 + Ce-t3/3 C. y = 4 + Ce-t2/2 D. y = 4x + Ce-t3/3
Write the ratio in standard ratio form and fractional form and as a simplified fraction.Every two weeks Rudy earns $1500. His paycheck stub shows that $400 was taken out for taxes. Tax Amount : After Tax Income
A. $1100 : $400; 
; 
B. $1100 : $1500; 
; 
C. $400 : $1500; 
; 
D. $400 : $1100; 
; 