Which of these is not an accomplishment of the apollo missions
a. to study the surface of the moon
b. to send rovers to mars
c. to orbit the earth for two weeks
d. to land on the moon

B. To send rovers to mars

Explanation:

The Apollo missions were carried out in the United States by NASA from 1961-1972 which received tremendous success in landing the first humans on the moon.

Based on the given options, the accomplishments of the apollo missions include:

A. To study the surface of the moon

C. To orbit the earth for two weeks

D. To land on the moon

The apollo missions were all lunar programs the centred around exploring the   surface and atmosphere of moon and did not focus on exploring mars.

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.