Acandidate scored 40 marks out of 120 wat was the percentage of the score

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?

The ratio of the perimeters of two similar triangles is 4: 3. what are the areas of these triangles if the sum of their areas is 130cm2?

Matt had 5 library books. he checked out 1 additional book every week without retuening any books. whats the matching equation