Why did scientists first hypothesize that a meteorite impact caused the extinction at the k-pg boundary (the end of the dinosaurs; note that this boundary used to be referred to as the k-t boundary and earlier versions of the book use this convention)?

The mathematical expression 9€ t means

Select the correct answer and solve for y

Will mark brainliest for correct answer! i have been on this problem for an hour and can't find the answer. i'm begging here! incase you cant read the instructions in the picture because of too much or too little lighting: note: enter your answer and show all the steps that you use to solve this problem in the space provided.write a list of steps that are needed to find the measure of b. provide all steps as clear as possible, !