When rounded to the nearest hundred thousand thousand will result in 2,400,000

The sum of two numbers is 12 and their difference is 18 what are the two numbers

Ill mark the brainliest if you me with the these three questions 7,8,9

When keisha installed a fence along the 200 foot perimeter of her rectangular back yard, she left an opening for a gate.in the diagram below, she used x to represent the length in feet of the gate? what is the value? a. 10 b. 20 c. 25 d. 30