Which of the following expressions is not correctly written in scientific notation?

A. 1 * 10^4

B. 9 * 10^2

C. 10 * 10^7

D. 5 * 10^3

What's another name for Mercury Venus Earth and Mars

In the sequence 5, 8, 11, 14, ... the value of the common difference, d, is:

Catherine says that you can use the fact 24:4=6 to find 240:4. Use the drop-down menus and enter a value to complete her explanation below.

What is the solution to the system of equations below? Negative 4 x + 6 y = negative 18 and y = negative 2 x + 21 (9, 3) (3, 9) (-9, - 9) (-9, 9)

Determine whether the improper integral converges or diverges, and find the value of each that converges. ∫^[infinity]_-[infinity] e^|x| dx

A newspaper reporter wants to know how popular the hobby of bird watching is in the city. He asked people at the local bird refuge if they watched birds as a hobby. Which of the following best explains whether the reporters data is valid or not?

I am very confused on how to figure out if y = 3/4x is proportional?

Alison wants to buy a mountain bike for $339.12. If she saves $28.26 each month, in how many months will she be able to buy the bike?

At 12 o'clock the temperature was 7°C. The temperature decreased by - 20°C. What is the new temperature?

Ashleys rentals charges $27.50 per hour to rent a surfboard and a wetsuit. Darlas surf shop charges $23.25 per hour to rent a surfboard plus $17 extra for a wetsuit.