Help please, it’s the last question

Which of the fallowing best completes the sequence 5,10,15, a) 30 b) 22 c)25 d)35

Pick the expression that matches this description: a polynomial of the 5th degree with a leading coefficient of 7 and a constant term of 6 (choice a) 7x^5+2x^2+6 (choice b) 7x^6−6x^4+5 (choice c) 6x^7−x^5+5 (choice d) 6x^5+x^4+7

Ateacher noticed 5/8 of the students were wearing either blue shorts or white shorts. write two different ways this could be done.