Regular polygon is a polygon with equal sides and equal angles!!!
290 million = 290,000,000
scientific notation would be 2.9 x 10^8
the 8 comes from the number of spaces you need to move the decimal point to the left to get 2.9
I don’t know if this will help....
I believe that the answer would be to add 10 to both sides, srry if I'm incorrect!