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.

Question

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

Answer 1

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