me not u lol
Apple have not made ten billion apps but they are about (at the time of writing) to sell the ten billionth app from the App store. They are offering a $10,000 iTunes Gift Card to the person who downloads the ten billionth app. (See links below)
No it hasn't but it will and the person who makes the billion download will receive a ten thousand dollar reward for being the twenty five billion person who downloaded something. The ten thousand dollar reward will be for the app store.
One ten-billionth meter or one ten-billionth of a meter.
One ten-billionth.
One ten billionth.
T U Th H TTh M B Tb
One ten billionth
never they haven't made that many yet
The tenth place to the right of the decimal point.
The 10 billionth song, "Guess Things Happen That Way" by Johnny Cash, was downloaded by Louie Sulcer of Woodstock, Georgia. As the grand prize winner of Apple's 10 Billion Songs Countdown contest, Louie will receive a $10,000 
iTunes Gift Card.
a hundred billion or eleven billion or ten billion and one or ten billion and one tenth or ten billion and one hundredth or ten billion and one millionth or ten billion and one billionth or ten billion and one trillionth and so on.
To give you an idea they are measured in Å : 1/10,000,000,000 (one ten billionth) of a meter (1×10−10 m)