What numbers have the greatest common factor of 13

Cybil flips a coin and rolls a fair number cube at the same time. what is the probability that she will toss tails and roll a number less than 3?

Evaluate-27 ^4/3/8 a) - 81/16 b) 81/16 c) 16/81

Suppose your school costs for this term were $4900 and financial aid covered 3/4 of that amount. how much did financial aid cover? and how much do you still have to pay?