What is the standard form of -10x62 plus 9x7 plus 5x3?

Answer 1

It is written in standard form as -5.42 x 102

If we add up the numbers we get:

(-10 * 62) + (9 * 7) + (5 * 3) =

-620 + 63 + 15 = -542

To put this in standard form we first have to move the decimal point so that there is just one digit before it. Then we multiply this by the necessary power of 10 to get back to the original number.

In the form of one digit before the decimal point it becomes:

-5.42

As this number is now 100 times smaller than our original amount (we know it is 100 times smaller because we have moved the decimal point by 2 places to the left) we have to multiply it by 100 (which is equal to 10 to the power of 2) to get back to the original number.

To show this we now write it as:

-5.42 x 102 (minus five point four two times 10 to the power of two)