If R0 is equal to 1, then will the virus spread and potentially become a major problem for large numbers of people across the world?

i am sorry but i need more information and a picture.

actually the answer is c

to figure the total magnification of an image that you are viewing through the microscope is really quite simple. to get the total magnification take the power of the objective (4x, 10x, 40x) and multiply by the power of the eyepiece, (usually 10x)