Question

Question content area top
Part 1
Which of the following numbers is written in scientific​ notation?
12
8.91
12 times 10 squared
8.91 times 10 squared
Question content area bottom
Part 1
Choose the correct answer below.
A.12 times 10 squared
12 times 10 squared
B.8.91
8.91
C.12
12
D.8.91 times 10 squared
8.91 times 10 squared

Answer 1

Correct answer: D. 8.91 × 10^2.

Reason: Scientific notation has the form a × 10^n with 1 ≤ |a| < 10. 8.91 × 10^2 meets this (a = 8.91), while 12 × 10^2 does not (a = 12 > 10).