the cost for 4 cellphone cases is $36 what is th e cost for 24 cases what is the cost for 20 cases plz help

What is the range of the data below? .8090100

For one history test, keith had to answer 40 questions. of these 40 questions, keith answered 28 of them correctly. what percent did keith get on his history test? round your answer to the nearest tenth if necessary

Consider the function y = f(x)=3^x the values of f(1/2) and f(1/4). rounded to the nearest hundredth, are__and__ respectively