Help pls this question is from math nation!

What is the lcm of 16 and 40 ? 24 and 40 ?

The graph of the function f(x) = (x + 2)(x + 6) is shown below. which statement about the function is true? the function is positive for all real values of x where x > –4. the function is negative for all real values of x where –6 < x < –2. the function is positive for all real values of x where x < –6 or x > –3. the function is negative for all real values of x where x < –2.

Find the solution of this system of equations -7x+y=-20 9x-3y=36