Can someone please help me with questions 1-5 ? I’ll give 200 points to whoever answers all the questions!!!

How to use order of operation in 20 divide by 4 multiply 5 = 1

Kayla made observations about the sellin price of a new brand of coffee that sold in the three different sized bags she recorded those observations in the following table 6 is $2.10 8 is $2.80 and 16 is to $5.60 use the relationship to predict the cost of a 20oz bag of coffee.

Jayne is studying urban planning and finds that her town is decreasing in population by 3% each year. the population of her town is changing by a constant rate.true or false?