According to the Wall Street Journal, 14,200,000 videotape copies of Walt Disney's Fantasia have been sold to date. Write that number in scientific notation?
A. 142 x 1,000,000
B. 1.42 x 106
C. 1.42 x 107
D. 142 x 107
2007-12-21 08:50:42 · 5 answers · asked by yummyummy 1 in Science & Mathematics ➔ Mathematics
Answer C.
1.42 x 10^7
To convert to scientific notation, always put the decimal after the first non-zero digit. In your case, after the 1 and before the 42. Drop any leading or trailing zeroes.
That gets you:
1.42
But then you need to figure out what power of 10 to put after it.
Compare the decimal places on the new number and the old number:
1.42
14200000.
Notice how you have to move the decimal place 7 spaces to the right to get to the old number. That means you should multiply the number by 10^7. This is equivalent multiplying by 10 million (10,000,000) which, as you notice, has seven zeroes. That's another way to remember it.
The final answer is:
1.42 x 10^7
2007-12-21 08:55:08 · answer #1 · answered by Puzzling 7 · 2⤊ 0⤋
The format is always n.nnnn....
So 1.42 is correct for the first bit
How many places to the right does the decimal between the 1 and 4 juump to get to number of sales - I make it 7
So 1.42x 10^7
2007-12-21 16:56:27 · answer #2 · answered by Anonymous · 2⤊ 0⤋
C. 1.42 x 10^7
2007-12-21 16:59:25 · answer #3 · answered by sv 7 · 1⤊ 0⤋
c is correct
for each 0 u see u will one 10^1
and the scientific notation must like (4.32 * 10^20 )
not like (43.2 * 10^19) or (0.432 *10^21)
C. 1.42 x 107
2007-12-21 17:29:13 · answer #4 · answered by navid f 1 · 1⤊ 0⤋
c
2007-12-21 16:57:41 · answer #5 · answered by ViewtifulJoe 4 · 1⤊ 0⤋