Express in scientific notation. Choose the answer with the proper number of significant figures.
69,000,000,000 = _____
69 x 109
6.9 x 1010
6.910
It has to be A, but I'm not exactly sure.
the format is to always have a single non-zero digit, followed by a decimal place time a power of 10
69,000,000,000
= 6.9 x 10^10 , exponent is 10 since we moved our decimal 10 places
oh, thank you that really helped. :)
210.000,000,000
To express a number in scientific notation, you need to move the decimal point so that there is only one non-zero digit to the left of the decimal. Then, count the number of places you moved the decimal point. If you move the decimal point to the left, the exponent in scientific notation will be positive. If you move the decimal point to the right, the exponent will be negative.
In this case, you are given the number 69,000,000,000. To express it in scientific notation, you need to move the decimal point 10 places to the left to obtain 6.9. Since you moved the decimal point to the left by 10 places, the exponent in scientific notation will be positive 10. Therefore, the correct answer is choice A: 69 x 10^9.