What is the decimal equivalent of 3.14 × 10^7?

is this the decimal equivalent? 31400000

What is the decimal equivalent of 2.8 e-4? (In the JavaScript web language, scientific notation normally written as 2 × 103 is written as 2e3.)

is the answer
= 0.00028?

YEs, and yes

Just a note on the use of e. Fifty years ago, when we programmed in Fortran, it would be written as 2.8EE-04

Many engineers and mathematicians used that, but in their personal notes, and on the blackboards, it was shortened to just one e (little e is easier to write than capital E), so 2.8e-4 would be the hand written version. It took and stayed, and many of us still use it. A few calculators use it also.

To find the decimal equivalent of a number in scientific notation, you need to multiply the base number (the number before the "e" or "× 10^") by the exponent (the number after the "e" or "× 10^").

For the first question, we have 3.14 × 10^7. To find the decimal equivalent, you would multiply 3.14 by 10^7. By performing the multiplication, the result is 31,400,000. So, yes, the decimal equivalent of 3.14 × 10^7 is indeed 31,400,000.

For the second question, we have 2.8 e-4 (or 2.8 × 10^(-4)). To find the decimal equivalent, you would multiply 2.8 by 10^(-4). By performing the multiplication, the result is 0.00028. So, yes, the decimal equivalent of 2.8 e-4 is indeed 0.00028.