That expression can’t be simplified and the answer is unknown. Finding what 3x+4y is impossible unless more information is provided.
To find the diameter, you use the formula: 2x. we use 2x because the radius is 2 times the diameter.
so, if the radius is 3,980, then we substitute that into the formula.
2(3,980)
this will give us 7960. the diameter is 7960 miles.
(9, 15) since when you multiply them by 3 both values are equivalent.
The answer to this problem is 9 hopefully this helps you!
