question:1. ³√[3(³√x-1/³√x)]=2, then ³√[x]+1/³√[x]= what....

question 2 If a=2b and b =4c, then ³√[a²/16bc]

question 3 the sides of a triangle are denoted by x,y,z. Area of the triangle and semi-perimeter of the triangle are denoted by P and q respectively. If P =√[q(q-x)(q-y)(q-z) and x+y-z = y+z-x = z+x-y = 4. Find P [in square units]

question 4. If a is any natural number, then a³-1/a³ will always be greater than or equal to

option 1. 3{a+1/a} option 2. a+1/a option 3. [a³+1/a³] option 4. 3(a+1/a)

i am only 8th... so please explain clearly.. i already posted the question.. i didn't get the answer and so i again posted.. this time help me out..please..

thanks a lot...