9ten thousandths in scientific notation

First write 9 ten thousands out as a decimal:

0.0009

To write in scientific notation, you move the decimal point to the right of the first whole number that isn't a zero. Count the number of spaces you move the decimal:

0.0009 becomes 9 and the decimal moved 4 places to the right.

Moving the decimal to the right means the exponent needs to be a negative number, so in this case the exponent becomes -4

The scientific notation is 9 x 10^-4

a.

step-by-step explanation:

step 1 distribute 2 to every term in the parentheses

step 2 add 10 on both sides of the equal sign