How do I do 13,505 in scientific notation?

Between 1899 and 1900, 284 of 1000 people in the united states were 5-17 years old

What operation does "the sum of 4 and 18" indicate?

If uq=6, find us and qs

19/5 as a improper fraction

What is the total of - 1 1/4 + 3/4+-1=

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.