Four people want to cross the river. there is only one boat available, and it can carry a maximum of 200 pounds. the weight of the four people are 109,170,110, and 90 pounds. how can they all manage to get across the river, and what is the minimum number of crossing required for the boat?

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.

answer: approximately 206 bones

i hope this u out a branlist and a would be greatly appreciated :