your local bank offers free checking for accounts with a balance of at least $500.suppose you have a balance of $516.46
问题描述：
your local bank offers free checking for accounts with a balance of at least $500.suppose you have a balance of $516.46 and you write a check for $31.96.how much must you deposit to avoid being charge a service free
答
=500-(516.46-31.96)=15.5
至少要存15.5美金那这一题呢??find real numbers x, y, z, and w for which it is true that x>y and z>w, but it is not true that x-z>y-w这个随便找几个数就好了x=100y=80z=20w=10