X/5 - 3 < 5
I need help

What are “like terms”? why can we only add like terms?

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

The diameter of the moon is about 3500 km. approximate the surface area of the moon using the formula for the surface area of a sphere, s = 4πr^2. write your answer in scientific notation.