Simplify (5x2 + 3x + 4) + (5x2 + 5x − 1). 10x2 + 8x + 5
25x2 + 8x + 3
10x2 + 8x + 3
10x2 + 8x − 3

first step to remove brackets

here write them in serial order,

=5x²+3x+4+5x²+5x-1

=5x²+5x²+3x+5x+4-1

=10x²+8x-3

If I'm not mistaken your answer should be the third option: 10x2 + 8x + 3

please tell me if im wrong

Step-by-step explanation:

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.