Find (3a2 - 2a + 4) - (a2 - 3a + 7) .

a. 2a^2 + a - 3

b. 2a^2 - 5a + 11

c. 4a^2 - 5a + 11

d. 4a^2 + a - 3

The physical fitness of an athlete is often measured by how much oxygen the athlete takes in (which is recorded in milliliters per kilogram, ml/kg). the mean maximum oxygen uptake for elite athletes has been found to be 60 with a standard deviation of 7.2. assume that the distribution is approximately normal.

The classrooms are trying to raise $1,200.00 for charity. mrs. leblanc's class has raised 50%. mr. patel's class has raised $235.14 ms. warner's class has raised 1/3 as much as mrs. leblanc's class. how much more money is needed to reach the goal of $1,200.00?

Which one is true about the hexagons ?