Jamie buys 10 pens and sells them for R5 each .if the 10 pens cost him R52 . calculate his profit or less per pen

Is the orthocenter of a triangle on the inside ?

Solve each quadratic equation by factoring and using the zero product property. x^2 - 8x + 30 = 3x

The weight of a radioactive isotope was 96 grams at the start of an experiment. after one hour, the weight of the isotope was half of its initial weight. after two hours, the weight of the isotope was half of its weight the previous hour. if this pattern continues, which of the following graphs represents the weight of the radioactive isotope over time? a. graph w b. graph x c. graph y d. graph z