Solve the problem.pH = -log10[H+] Find the [H+] if the pH = 6.4.
A. 3.98 × 10-6
B. 2.51 × 10-6
C. 3.98 × 10-7
D. 2.51 × 10-7
Answer: C
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Add. -6.332 + (-3.530)
A. 2.802 B. -9.862 C. 9.862 D. 22.352
Solve.How many real solutions are possible for a system of equations whose graphs are a parabola and a hyperbola?
A. 1, 2, or 3 real solutions B. 0, 1, 2, 3, or 4 real solutions C. 0, 1, 2, or 3 real solutions D. 1, 2, 3, or 4 real solutions
Solve the problem.Given cot ? = 4 , use trigonometric identities to find the exact value of sec2 ?.
A. 
B. 
C. 
D. 
Solve the problem.The amount of water (in gallons) in a leaky bathtub is given in the table below. Using a graphing utility, fit the data to a third degree polynomial (or a cubic). Then approximate the time at which there is maximum amount of water in the tub, and estimate the time when the water runs out of the tub. Express all your answers rounded to two decimal places.
A. maximum amount of water after 8.23 minutes; water runs out after 19.73 minutes B. maximum amount of water after 5.31 minutes; water never runs out C. maximum amount of water after 5.31 minutes; water runs out after 8.23 minutes D. maximum amount of water after 5.37 minutes; water runs out after 11.06 minutes