Final answer:
Kayla spent $3.465 x 10⁻⁷ on downloading songs from ITUNES.
Step-by-step explanation:
To calculate how much money Kayla spent on downloading songs from ITUNES, we can use the formula: cost per song x number of songs downloaded. In this case, the cost per song is 9.9 x 10⁻¹ cents and the number of songs downloaded is 3.5 x 10. To find the total amount spent, we multiply the two numbers together:
(9.9 x 10⁻¹) x (3.5 x 10) = 9.9 x 3.5 x (10⁻¹ x 10) = 34.65 x 10⁻⁸ = 3.465 x 10⁻⁷
So, Kayla spent $3.465 x 10⁻⁷ on downloading songs from ITUNES.