Amanda says that a human fingernails has a thickness of about 4.2 x 10^-4 meter. justin says that a human fingernails has a thickness of about 0.42 millimeters .

what is the width in meters written in standard notation?

do justin’s and amanda’s measurements agree? explain .

explain why justin’s estimate of the thickness of a human fingernail is made appropriate than amanda’s estimate.

See below

Step-by-step explanation:

1. Standard notation

4.2 × 10⁻⁴ m

A negative exponent indicates

4.2 × 10⁻⁴ tells you that the decimal number is 4.2, with the decimal point moved four places to the left.

The number becomes 0.000 42 .

2. Metres to millimetres

3. Measurements agree?

Yes, because both measurements are the same as 0.42 m.

4. More appropriate measurement

Most measurements should be expressed as a number between 0.1 and 1000, because most people aren’t particularly good at visualizing larger or smaller numbers.

Justin's measurement of 0.42 mm is more appropriate than Amanda's measurement of 4.2 × 10⁻⁴ m.

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step-by-step explanation: