Help 30 pts plus brainliest.

The sum of two numbers is 86, and their difference is 20. find the two numbers

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 happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?