Let a and b be mxn and r xs matrices respectively. use summation notation to define ( the ij" entry of the product ab. explain carefully why we need n=r for this definition to make sense.

Find the length of cu, the triangles are similar.

You are making a battery for a science project. you have copper wire for your first electrode. you need to choose a conductor, a second electrode, and a device to plug into your battery. you have already chosen a lemon conductor. complete each statement below about the options that include a lemon conductor.

Given ab and cb are tangents of p, and m =10°. what is the measure of abp?