Question

how many significant figures does 1.90 have?
a 8
b 6
c 4
d 3
e 2

Explanation:

Step1: Identify significant - figure rules

Non - zero digits are always significant. Trailing zeros after a decimal point are significant.

Step2: Analyze 1.90

The digits 1 and 9 are non - zero and significant. The 0 after the 9 and after the decimal point is also significant.

Answer:

D. 3