Which line should be used as the trend line?

You’re giving a cube with a length of 2.5 cm and a width of 2.5 cm and a high of 2.5 cm you place it on a scale and it is 295 g calculate the density

Find the domain and range of the following function f(x) = 51x - 21+ 4

Show all work to identify the discontinuity and zero of the function f of x equals 6 x over quantity x squared minus 36