Robin earned $4,320 in 9 weeks. how much did he earn working for a full year? (assume robin worked 50 weeks during the year.)

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.

Select the correct answer from each drop-down menu. a system of equations and its solution are given below. system a complete the sentences to explain what steps were followed to obtain the system of equations below. system b to get system b, the equation in system a was replaced by the sum of that equation and times the equation. the solution to system b the same as the solution to system a.]