Jonathan and samantha row their canoe 39 miles downstream in 3 hours. after a picnic, they row back upstream. after 4 hours they only travel 20 miles. assuming that they canoe at a constant rate and the river's current is constant, find the speed at which jonathan and samantha can row in still water.

Next, chad created this graph with ordered pairs that show the possible ratios of the number of damage to defense cards in his deck. what error chad make?

Aswimming pool has an input pump for filling the pool and an output pump for emptying the pool. the input pump can fill the pool in 3 hours, and the output pump can drain the pool in 5 hours. as you go to bed, the pool is full, but a neighbor’s kid turns on the output pump. at midnight, you awake to find the pool half empty. immediately, you turn on the input pump, but you are sleepy and forget to turn off the output pump. at what time will the pool become full?

At $1.32 million, they closed last month percent above what they paid in 2007." how much did they pay in 2007?