With parallel lines, ? i know that in order for two lines to be parallel, their slopes must be exactly equal. however, is it true that in order for these lines to be parallel, their slopes must be positive? in advance!

Asequence is defined recursively by the formula  f(n  +  1)  =  f(n)  +  3 . the first term of the sequence is  –4. what is the next term in the sequence? –7–117

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?

It is saturday morning and jeremy has discovered he has a leak coming from the water heater in his attic. since plumbers charge extra to come out on the weekends, jeremy is planning to use buckets to catch the dripping water. he places a bucket under the drip and steps outside to walk the dog. in half an hour the bucket is 1/5 of the way full. what is the rate at which the water is leaking per hour?