How many significant figures does each value contain?
the measurement 400 ml has significant figures.
the measurement 208 ft has significant figures.

The measurement 400 mL has one significant figure.

The measurement 208 ft has three significant figures.

Step-by-step explanation:

Non-zero digits are always significant.

Zeros between significant digits are also significant.

Trailing zeros are significant only after a decimal point.

400 has only one significant figure.  4 is a non-zero digit, so it's significant.  Trailing zeros in a whole number aren't significant.

208 has three significant figures.  2 and 8 are non-zero digits, so they're significant.  The 0 is between significant figures, so it's also significant.

400 mL has 1 significant digit.

208 has 3 significant digits.

the simplified form is

step-by-step explanation:

we want to simplify the expression,

let us change the middle bar to a normal division sign to obtain,

we multiply the first fraction by the reciprocal of the second fraction to obtain,

we factor to obtain,

we cancel the common factors to get,

we simplify to get,

the correct answer is b