Lisa is cooking muffins. the recipe calls for 7 cups of suger. she already put in 2 cups. how many more cups does she need

Many newspapers carry a certain puzzle in which the reader must unscramble letters to form words. how many ways can the letters of emdangl be arranged? identify the correct unscrambling, then determine the probability of getting that result by randomly selecting one arrangement of the given letters.

Is experimental probibilty the same as the observed frequency in math? i need the answer asap!

Use mathematical induction to prove the statement is true for all positive integers n, or show why it is false. 1^2 + 4^2 + 7^2 + + (3n - 2)^2 = [n(6n^2-3n-1)/2]