If t100=1400  and  t400=1100  of an A. P, and kth  term is 1, then k50=  ___

Diane owes $387 to her brother. if she debits her bank account $161.25 a month to pay him back, how many months will it take her to pay off the debt?

The number of branches on a tree demonstrates the fibonacci sequence. how many branches would there be on the next two levels of this tree? 13 | | | m branches

Arectangle has a width of 5 cm and a length of 10 cm. if the width is increased by 3, how does the perimeter change?