I need you to answer my question please here it is −11+23×(−12)+4÷18

When using the linear combination metho e linear combination method to solve a system of linear equations, the four options are:

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

When you have 25 numbers, and jake picks 3 random numbers and puts them back, what is the chance bob has of picking those 3 numbers when he picks 6 random numbers (without putting them back)? explain.