An airplanes altitude changed -531 feet over 9 minutes. what was the mean change of altitude in feet per minute

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

Factor -8x3-2x2-12x-3 by grouping what is the resulting expression?

Type the correct answer in each box. spell all the words correctly, and use numerals instead of words for numbers. if necessary, use / for the fraction bar(s).