Anu and Eby went on a hiking trip that was 36 km. Amy's backpack weighed 7kg and Eby's backpack 8kg. They hiked 9km the 1st day and 6km the 2nd day. If they hiked equal number of km the next 3 days, how many km a day did they hike on these days?

7km

Step-by-step explanation:

Hi, to answer this question, first we have to add the kilometers hiked in the first 2 days.

9km+6km= 15km

Since the trip was 36km, we have to subtract 15 to 36:

36-15= 21 km left

Since they hiked an equal number of km the next 3 days, we have to divide the remaining km by 3:

21/3 = 7km

Feel free to ask for more if needed or if you did not understand something.

we need the options

step-by-step explanation:

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.