Which of the following fractions is larger? 2/5,1/3,1/15

Factor -8x3-2x2-12x-3 by grouping what is the resulting expression?

Find the value of p for which the polynomial 3x^3 -x^2 + px +1 is exactly divisible by x-1, hence factorise the polynomial

Jonathan can type 20 documents in 40 minutes ,and susan can type it in 30 minutes and jack can type it in 24 minutes working together ,how much time will it is take them type the same document