In 1981 children in the united states spent an average
of slightly less than two and a half hours a week doing
household chores; by 1997 they had spent nearly six
hours a week.
a. chores; by 1997 they had spent nearly six hours
a week
b. chores; by 1997 that figure had grown to nearly
six hours a week
c. chores, whereas nearly six hours a week were
spent in 1997
d. chores, compared with a figure of nearly six hours
a week in 1997
e. chores, that figure growing to nearly six hours a
week in 1997

D. chores, compared with a figure of nearly six hours  

a week in 1997.

Explanation:

The use of past perfect in the second sentence of the example provided is incorrect since that action developed after the first one. In other words, children spent less than 2 and a half hours a week doing household chores in 1981 and 16 years later (in 1997) this figure increased to 6 hours a week.

explanation:

nutelal

both are true, the congress does have the power to create banks, even if this power is not specifically described in the constitution, since there is nothing restricting it and there is power given to the congress to make "all laws which shall be necessary and proper". maryland was not allowed to tax a branch of the national bank operating there, and the supreme court decided that no state could. both of these topics were discussed in a decision of the mcculloch v. maryland case in 1819.