7. Write the equation of a line which is parallel to y=-31.+4 but contains the point (-7, 12)
8. Write the equation of the line which is perpendicular to y=-84-1
and passes through the point (-8,3).

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?

Liz had 140 pens and inna had 100 pens. after inna gave liz some pens, liz had 3 times as many pens as inna. how many pens did inna give liz?

In triangle abc, angle c is a right angle. find the value of the trig function indicated. find tan a if c = 17 and a = 8