About nine seconds.
thirty and nine tenth in decimal = 30.9
The root of 40 is 6.32455532 which is 6.3 to the nearest tenth.
One-tenth of 40 is one-tenth times 40.40 x 1/10 = 40 ÷ 10 = 44
2.8735 to the nearest tenth is 2.9.
450
1 tenth
40 * 1/10 = 4
nine=nueve
400/10 = 40
40^10 is equal to 10,485,760,000,000,000.
3/10 of 40 = 12