the average human body cell is about 5.1 x 10^-4 cm in diameter. the diameter of a plant cell is 8 x 10^-3 cm.
what is the combined diameter of the body cell and plant cell?

8.51×10^-3 cm

Step-by-step explanation:

Hope this helps :)

Step-by-step explanation:

In order to add or subtract numbers in scientific notation, the powers of ten must have the same exponent.  In this caes the diameter of an average human body cell is a power of -4 and the diameter of a plant cell is a power of -3.  In order to add them, we can move the decimal over for the body cell diameter:

Add the two values:

i think its 0.6. jdnsllq