In 1900, a certain country's population was 76,199,547 and is area was 2,946,710 square miles. in 1980 the country's population was 279,473,159 and its area was 3,709,407 square miles. the population density, to the nearest tenth in 1900 was

The size of a certain cell is 2.5*10^-9m. another cell is 1.5*10^3 times larger. how large is the larger cell in scientific notation?

The table shows the balance of a money market account over time. write a function that represents the balance y(in dollars) after t years.

Liz is shipping a package to her friend.the maximum weight of a medium flat-rate box is 20 pounds,including the box which weighs 6 ounces.write and solve an inequality to describe the possible weight ,w, of the contents that liz will ship to her friend if she must use a medium flat-rate box.