how do you write and solve an equation to determine the radius of mars

the radius of earth is 6378.1 km, which is 2981.1 km longer than the radius of mars

4 answers

6378.1 - 2981.1 = ?
you simply take the equation:
6378.1 - 2981.1=mars radius

a-b= Answer
Maggies' brother is 3 years younger than twice her age. The sum of their ages 24. How old is Maggie
The radius of earth is 6378.1 km, which is 2981.1 km longer than mars write and solve an equation to determine the radius of mars