I need help with it pls help I will really appreciate it !

Describe all the numbers that when rounded to the nearest thousand are 645,000

If 1 is divided by the sum of y& 4. the result is equal to 3 divided by 4 .find the value of m?

If your annual gross income is $62,000 and you have one monthly car payment of $335 and a monthly student loan payment of $225, what is the maximum house payment you can afford. consider a standard 28% front-end ratio and a 36% back-end ratio. also, to complete your calculation, the annual property tax will be $3,600 and the annual homeowner's premium will be $360.