Which of these is the algebraic expression for "nine less than some number? "

9 / k
k / 9
9 − k
k − 9

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

Angela rode his bike around a bike trail that was 1/4 of a mile long he rode his bike around the trail 8 * angelo says he wrote a total of 8/4 miles to russell says he's wrong and he actually and says that he actually wrote to my who is corrupt use words and trying to explain how you know.

Solve for x -2.3(r - 1.2 ) = -9.66 enter you answer as decimal.