There are 500 people in a building. 20% of half of them went out. 15% of those who went out came back in. How many people are in the building now?

Issof claims that the scale factor is 1/2. which statement about his claim is correct

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?

Identify the function that contains the data in the following table: x     -2         0         2         3         5     f(x)     5         3         1         2         4     possible answers: f(x) = |x| + 1 f(x) = |x - 2| f(x) = |x - 2| - 1 f(x) = |x - 2| + 1