Estimate by rounding:
?
?
A. 4.004
B. 40.04
C. 0.4004
D. 400.4
Answer: A
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Rewrite each number using scientific notation before performing the operation. Leave your answer in scientific notation form.3 × 10-35 + 5 × 10-34
A. 5.3 × 10-33 B. 8.0 × 10-34 C. 5.3 × 10-34 D. 5.3 × 10-35
Convert the measure to its alternate U.S. or metric form. Write improper fractions as mixed numbers for U.S. measures and as decimals for metric measures.Convert 19
pounds to kilograms.
A. 8.75 kilograms B. 17.5 kilograms C. 17 kilograms D. 9.25 kilograms
Use the elimination method to solve the system.
A. x = 1, y = 1 B. x = 1, y = 0 C. x = 0, y = 0 D. x = 0, y = 1
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. 102 B. 10-2 C. 0.5 D. 0.69