Jenna calculated several numbers in her calculator. The result displayed 1.8E-4 on the calculator screen. Which equivalent number(s) does this represent? Select all that apply.

-0.00018
1.8 × 10 -4
18 × 10 4
0.00018
1800

1 answer

The notation 1.8E-4 represents the scientific notation for the number \( 1.8 \times 10^{-4} \), which is equal to \( 0.00018 \).

Let's analyze the options:

  1. -0.00018: This is not equivalent; it has a negative sign.
  2. 1.8 × 10 -4: This is equivalent. It represents the same value as 1.8E-4.
  3. 18 × 10 4: This is not equivalent. This equals \( 180 \), which is much larger than \( 0.00018 \).
  4. 0.00018: This is equivalent; it is the decimal form of \( 1.8E-4 \).
  5. 1800: This is not equivalent; it's much larger than \( 0.00018 \).

The correct answers are:

  • 1.8 × 10 -4
  • 0.00018