Last are a popular mobile apps downloaded 2.47 *10^8 times .write the number of times the app was downloaded in standard form

Which of the following system of equation is not equal to the system of equations is not equal to the system of equations shown below

Simplify this expression.2(10) + 2(x – 4) a. 2x + 16 b. x + 12 c. 2x + 12 d. x + 16

What are the solutions of the equation? z^2 + 11z + 24 = 0 a. 8, -3 b. 8, 3 c. -8, -3 d. -8, 3