twelve and nine tenths seconds = 12 + 9/10 s = 12 + 0.9 s = 12..9 s = 1.29 × 10¹ s
10-12 in standered form = -2
0.9
recommended standered
Probably an incorrect spelling of "standard form".
15,000
2 and 1/2 2.5
640
6x10+3x1+7x1/10
It is 1.234*102.
That one.
15 cubed is equal to 3,375.
56.18