Good families are much to all their members, but ______ to none.

It’s a ______ clock, made of brass and dating from the nineteenth century.

______ ourselves from the physical and mental tension, we each need deep thought and inner quietness.

If x+y≥a, x-y≤-1 and the minimum value of z=x+ay is 7, a=?

For hyperbola (x2)/(a2)-(y2)/3=1 (a>0), suppose the eccentricity is 2, then a=?

To understand the academic performance of 1,000 students, the systematic sampling method is adopted to choose 40 samples. What should the sampling interval be?

Four students can choose to participate in a charity event either on Saturday or Sunday. What’s the probability that there is at least one student at both Saturday's and Sunday's events?

According to the U.S. Constitution, each state's representation in the U.S. House will be determined by “adding to the whole number of free persons ... three fifths of all other persons.” This rule goes against which principle in the Declaration of Independence?

In a letter to James Madison in March 1787, George Washington wrote, “That a thorough reform of the present system is indispensable, none who have capacities to judge will deny—and with hand and heart I hope the business will be essayed in a full Convention.” What does the “thorough reform” refer to?

Banks charge processing fees and interest when granting loans. They charge fees because of the services provided, such as account management. The reason for claiming interest is that