Guillermo is a professional deep water free diver.
His altitude (in meters relative to sea level),x seconds after diving, is modeled by
g(x)= 1/20x(x-100)
How many seconds after diving will Guillermo reach his lowest altitude?

How many is in each case if there is 12 in each case it would be 40

Ithink it can be put them in order by 4 possible ways.that mean 3 group of 10 rocks,or an another group of 8 rocks.

1.   an exact solution requires a radical solution - no decimal approximation.2. (a)4x^3 = 756x^3 = 756/4 = 189x =   cube root of 189 =   5.74   to nearest hundredth answer(b)   189 = 3*3*3*7   so we can write the cube root of 189 as 3∛7 answerchecking (a) 4*(5.74^3 =   756.48   which is very close(b)   4* ((3∛3)^3   = 4*189   = 756   - spot on! 3. i would use solution b because the original question asked for an exact solution.