90 divided by 2= 45 so x=45
2•45=90
So, for the next one y=60 because 90+90=180
3•60-2•45=90
B. (k+10f)(k-5f) you can tell in 2 ways. 1. if the second sign is neg then the signs in the factors are going to be one neg and one positive so that knocks out C and D. Then you look at the second term and since the 5 is positive then the 10 has to be positive so you end up with a positive 5kf.
The second way is to FOIL them out. When you check B you get

combine your like terms and you have your original expression of

Hope that helps
Answer:
" > "
Step-by-step explanation:
-4/5=4x9 5×9
-4/5 = - 36/ 45
-8/9=8×5 9×5
-8/9 =-40/45
-36/ 45 > -40/45
-4/5 > -8/9
in this case - 4/5 is closer to 0