Solve.Find the hydrogen ion concentration of a solution whose pH is 7.3. Use the formula 
A. 2.00 × 107
B. -0.8633229
C. 0.86332286
D. 5.01 × 10-8
Answer: D
Mathematics
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Find the surface area of the sphere satisfying the given condition. Approximate values to the nearest tenth.radius = 7 cm
A. 1436.0 cm2 B. 615.6 cm2 C. 205.1 cm2 D. 153.9 cm2
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Round the decimal to the given place value.3.925 (nearest tenth)
A. 3.8 B. 3.9 C. 4
Mathematics
Evaluate the terms of the sum using the given information.x1 = -5, x2 = 3, x3 = 5, x4 = -1, and ?x = 0.5; f(x) = 
A. - 2 + 
+ 
+ 
B. - 
+ 
+ 
+ 1
C. - 
+ 
+ 
- 2
D. - 
- 
+ 
- 1
Mathematics
Multiply.
? 
A. - 
B. - 
C. 
D. - 
Mathematics