Which expression is the largest number?

a. 40.1 x 10^-6***
b. 4.1 x 10^-7
c. 0.411 x 10^-7
d. 0.04001 x 10^-5

A is correct, because that = 0.0000401.

B = 0.00000041
c = 0.0000000411
D = 0.000004001
Hoped it helped!

a is actually 4.01 * 10^-5

so yes it is the biggest

To determine which expression represents the largest number, we can compare the exponent part of each expression. The smaller the exponent, the larger the number.

Let's simplify each expression to make the comparison easier:

a. 40.1 x 10^-6 can be simplified as 0.0000401
b. 4.1 x 10^-7 can be simplified as 0.00000041
c. 0.411 x 10^-7 can be simplified as 0.0000000411
d. 0.04001 x 10^-5 can be simplified as 0.00000004001

Now, it is clear that expression a (40.1 x 10^-6) is the largest number among the given expressions, as it has the largest coefficient (40.1) and the smallest exponent (-6).

Therefore, the correct answer is a. 40.1 x 10^-6.