Use a calculator to find the approximate value of the composition. Round your answer to four decimal places. The expression may be undefined.cos 
A. -0.3827
B. 0.8819
C. 0.3827
D. -0.8819
Answer: A
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Solve the problem.The hydrogen potential, pH, of a substance is defined by 
where the hydrogen ion concentration, [H+], is measured in moles per liter. Find the hydrogen ion concentration of a solution whose pH is 7.4.
A. 3.98 × 10-8 moles per liter B. 0.86923172 moles per liter C. 2.51 × 107 moles per liter D. -0.8692317 moles per liter
Perform the indicated operations. Write the answer in simplest form.- 
÷ 
A. 
B. 3
C. - 3
D. 
Decide whether the relation is a function.?
A. Function B. Not a function
Use the end behavior of the graph of the polynomial function to determine whether the degree is even or odd and determine whether the leading coefficient is positive or negative.
A. even; positive B. odd; positive C. even; negative D. odd; negative