Solve the problem. Round your answer to the nearest tenth, when appropriate. Use the formula 
, as needed.Find the pH if [H3O+] = 4.2 × 10-7.
A. -7.6
B. 7.6
C. 6.4
D. 6.7
Answer: C
Mathematics
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Find the distance between the pair of points. Where appropriate, give an approximation to three decimal places.(7, -7) and (3, -1)
A. 2
? 7.211
B. 20
? 44.721
C. 10
D. 20
Mathematics
Solve the problem.Find the effective rate corresponding to the nominal rate. 6% compounded quarterly. Round to the nearest hundredth.
A. 6.09% B. 6.20% C. 6.14% D. 6.23%
Mathematics
Find the slope of the line tangent to the graph of the function at the given value of x.y = -8x-1 + 5x-2; x = 2
A. 
B. - 
C. - 
D. 
Mathematics
Solve the right triangle.
B = 34°, b = 41.2
A. A = 34°, a = 27.8, c = 34.2 B. A = 56°, a = 61.1, c = 73.7 C. A = 56°, a = 61.1, c = 49.7 D. A = 34°, a = 27.8, c = 73.7
Mathematics