Solve the problem.Find the hydrogen ion concentration of a solution whose pH is 7.5. Use the formula 
A. -8.75 x 10-1
B. 8.75 x 10-1
C. 3.16 x 107
D. 3.16 x 10-8
Answer: D
Mathematics
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Find the arc length function s(t) for the curve defined by r(t) = FIGURE 1.png)
costi+ FIGURE 1.png)
sintj+ FIGURE 1.png)
k for t?0. Then use this result to find a parametrization of C in terms of s.
What will be an ideal response?
Mathematics
Write as an equivalent addition statement. (Do not evaluate.)1 - 21
A. 21 + (-1) B. 1 + 21 C. 1 + (-21) D. 21 + 1
Mathematics
Find the unit vector in the same direction as the given vector.v = -2j
A. u = -j
B. u = 4j
C. u = - 
j
D. u = -2j
Mathematics
Add or subtract. Write the answer in lowest terms.
+ 
A. 
B. 
C. 
D. 
Mathematics