What is the explanantion for the answers

Mercy Hospital surveyed 2,700 patients who were admitted to the hospital last year and stayed at least two nights.

Jose wants to build a model of a 180 m tall building he will be using a scale of 1.5 to 3.5meters how tall will the model be round your awnser

A countries population in 1992 was 39 million in 1997 it was 42 million estimate the population in 2009 is an exponential growth formula

Jack made $30 mowing lawns in may and $72 mowing lawns in June. By what percent did the amount of money jack made mowing lawns increase from may to June?

the half life of a radioactive isotope is the time it takes for a quantity of the isotope to be reduced to half its initial mass. starting with 165 grams of radioactive isotope how much will be left after 4 half lives.

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.