Please help me answer this question

Divide Decimals

127.6÷10 with the power of 5

How do you find the area of a triangle

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)

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