1. which expression is a cubic polynomial?
3x^2 - 1
x^3 - 1
x^2 - x + 3
3x^2 - x + 3

2.which of the following binomials is a factor of x^3 + 4x^2 +x - 6?

3. if a polynomial equation p(x) = 0 has 3 + 4i as a solution, what other solutions must it have?

solution:

as, mean is defined as sum of all the observations divided by total number of observations.

and , median is mid value of the data whether arranged in ascending order or descending order.

consider, roadsters:

2,3,4,5,6,7,8,9

mean =

also, median= , because number of observations is even, so median is mean of two mid values.

now, coming to bandits

2,3,4,5,6

mean =  

median = 4, as number of observations is odd.

so, roadsters has greater median as well mean than bandits.

→option a is true about the repairs performed on 2 types of cars:

bandits have lower median and mean than roadsters.