-Thinking Critically-
When subtracting or adding two numbers in scientific notation, why do the exponents need to be the same?
-Applying Concepts -
You are converting 68 km to meters. Your answer is 0.068 m. Explain why this answer is incorrect and the likely source of the error.
Please help? and thank you!
2007-09-18 10:27:11 · 3 answers · asked by R3B3LL10N 1 in Science & Mathematics ➔ Chemistry
Use proportions. Now 1000 m = 1 km.
1 km/1000 m = 68 km/X.
Cross multiply and X= 68000 m. Remember if a unit is larger than the one you convert TO, the number you get will be LARGER than the one you have.
2007-09-18 10:33:59 · answer #1 · answered by cattbarf 7 · 0⤊ 0⤋
1 km = 1000 m so multiplying both sides of the equation by 68 yields 68 km = 68,000 m. The idea was correct but you moved the decimal the wrong direction. I am not sure what this has to do with exponents.
2007-09-18 17:38:22 · answer #2 · answered by brotherlove@sbcglobal.net 4 · 0⤊ 0⤋
1) the decimal point will be in a different place. i.e. 2^10 + 2^100 wouldn't be 4^110. but rather 2200.
2)dang i can't remember the metric system sorry.
2007-09-18 17:34:14 · answer #3 · answered by jessi f 2 · 0⤊ 0⤋