Determine the points of intersection for x^2+y^2=1 and y= x+1

Given a(-12,5) and b(12,29) find the point that divides the line segment ab three-eighths of the way from a to b

Two blends of tea are mixed to make a blend that will be sold at the fair. black tea sells for $2.20 per pound and orange pekoe tea sells for $3.00 per pound. how much of each should be used to obtain a 4lb blend selling for $2.50 per pound?

Me! 50 points! why does when we come home, our door is unlocked and there is grease on the door knob, me solve this , and i don't know what category this goes under