How many diffrent three letter permutation can be formed from letter in the word decagon

The graph below represents the number of dolphins in a dolphin sanctuary. select all the key features of this function.

The larger of two number is 4 less than twice the smaller number. the sum is 41. find the numbers

Determine the common ratio and find the next three terms of the geometric sequence. 10, 2, 0.4, a. 0.2; -0.4, -2, -10 c. 0.02; 0.08, 0.016, 0.0032 b. 0.02; -0.4, -2, -10 d. 0.2; 0.08, 0.016, 0.0032 select the best answer from the choices provided a b c d