Help me my mom won’t let me sleep until I finish it

Find the solution of system of equation y= x-4 y=4x+2

Aproduction manager test 10 toothbrushes and finds that their mean lifetime is 450 hours. she then design sales package of this type of toothbrush. it states that the customers can expect the toothbrush to last approximately 460 hours. this is an example of what phase of inferential statistics

What is the effect on the graph of the function f(x) = x2 when f(x) is changed to f(x) − 4?