Linda loans her friend $250 with a 5% monthly intrest rate. how much was the whole loan?

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

What adds to be the bottom number but also multiplies to be the top number with 8 on the bottom and 15 on top

Line u passes through points (-52, -18) and (-29, 53). line v passes through points (90, 33) and (19, 56). are line u and line v parallel or perpendicular?