Solve the equation for the specified variable.P = 
for r
A. r = 
B. r = P - tA
C. r = 
D. r = 
Answer: A
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Round to the indicated place value.Round to the nearest thousandth: 6.49993
A. 6.490 B. 6.590 C. 6.500 D. 7.000
Solve the problem.The pH of a solution ranges from 0 to 14. An acid has a pH less than 7. Pure water is neutral and has a pH of 7. The pH of a solution is given by 
where x represents the concentration of the hydrogen ions in the solution in moles per liter. Find the hydrogen ion concentration if the 
A. 3.98 x 10-9 B. 2.51 x 10-9 C. 2.51 x 10-8 D. 3.98 x 10-8
Solve the problem.The logistic growth model 
represents the proportion of the total market of a new product as it penetrates the market t years after introduction. When will the product have 65% of the market?
A. 4.33 years B. 3.09 years C. 2.09 years D. 3.33 years
Let x represent one number and let y represent the other number. Use the given conditions to write a system of nonlinear equations. Solve the system and find the numbers.The sum of the squares of two numbers is 41. The sum of the two numbers is -9. Find the two numbers.
A. 4 and 5 B. -5 and 4 or -4 and 5 C. -5 and -4 D. -5 and -4 or 4 and 5