In index form, 49 can be expressed as (7^2). This notation indicates that 49 is equal to 7 raised to the power of 2. The base, 7, is the number being multiplied by itself (in this case, twice), and the exponent, 2, represents the number of times the base is multiplied by itself.
"index" is the singular form - "indices" is the plural :)
The possessive form of the singular noun index is index's.
indices or indexes
The plural form for the noun index is indexes.
40.000000 in standard index form is 4.0 × 101
Index form of 9765625 is 9.765625 × 106
5,200 in standard index form = 5.2 × 103
8890 in standard index form = 8.89 × 103
10/49 is in its simplest form.
12/49 is in its simplest form.
49/72 is in its simplest form.
The singular is the noun "index".