231km811 m + 485km 829m

717.64 kilometers

Step-by-step explanation:

won't answer for ya cuz I've got my own things to do but:

take all your measurements and convert them into 1 unit. then add and boom there's your answer

hint: every km has 1000m, every 1000m has 1km.

option (a)

step-by-step explanation:

step 1:   take 2 number whose product equal to 25..

and sum of those two number are -10

step: 2 for example here if we take 5,5 are the number,,

5*5=25

and

5+5=10

but we need -10

so if we take   -5,-5

so -5*-5=25

and -5+(-5)=-10

s0

come the equation

replace -10x by these number

like -5x -5x+25

take common

x(x-5)-5(x-5)=0

(x-5)(x-5)=0