What is the increase in the world population over the last 10 years? what site did you use to locate this information?

7. if the value of x varies directly with the value of y, and x = 3 when y = 21. what is the valu y, and x = 3 when y = 21. what is the value of x when y = 105?

Give the equations of two different lines that are perpendicular to the line 3x + 4y = 7.

What is 140% of 25? because i need