4.9 million (or 4.9 x 106) in standard notation is 4,900,000
0.49 = 49/100
49 = 4.9 × 101
72 = 49 = 4.9*101
$49,000,000.00
It is: 49,000,000
49,000,999
The standard form for the number 49 is simply 49 itself. However, if you are referring to its representation in scientific notation, it can be expressed as (4.9 \times 10^1). In mathematical contexts, standard form can also mean expressing numbers in a way that highlights their place value, but for integers like 49, it remains as is.
You cannot wright it. However, you can write it as 4.9*10-5
1457 = 1*72 + 4*7 + 5 = 1*49 + 4*7 + 5 = 49 + 28 + 5 = 82
In today's notation of Roman numerals 49 is given as XLIX. But the Romans themselves would have probably notated 49 as IL because it's a simplification of XXXXVIIII.
49 = 4.9 × 101
The quotient of 49 and ( x ) can be written as ( \frac{49}{x} ). This notation indicates that 49 is being divided by ( x ). You could also express it as ( 49 \div x ), but the fractional form is more commonly used in algebra.