Solve for X

Special segments in triangles

100 points, hi, i’m not sure how to get the equation from the graph and table.

Find an equation for the linear function which has slope -10 and x-intercept -7

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