April 2016 mathematics Cambridge primary paper 2 stage 6​

How is the number of vertices for a prism related to the name of the prism

When using the linear combination metho e linear combination method to solve a system of linear equations, the four options are:

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?