Compare the x intercepts of f (x) and -f(2x)

Noor brought 21 sheets of stickers. she gave 1/3 of a sheet to each of the 45 students at recess. she wants to give teachers 1 1/2 sheets each.

What is the difference between the predicted value and the actual value

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels