Answer:
1.
Explanation:
1. They are made up of two or more Pure substances that are not chemically bonded together and appear non-uniform
A heterogeneous mixture is not chemically combined and its components are visible and can be seen.
the average speed is 23.4 km per hour cause it is total distance over total time equal to average speed
0.000735 in scientific notation is 7.35 x 10^-4
