1. a+b+c=9 and ab+bc+ca =26 find a²+b²+c². 2. if 2x +3y=12 and xy=6 find the value of 8x³+27y³.
3. factorise (a+b)³-(a-b)³.
4. if a+b+c =5 and ab+bc+ca =10 then prove that a³+b³+c³-3abc=-25

Plzzcan somone solve these question its urgent

At a sale this week, a desk is being sold for $213. this is a 29% discount from the original price. what is the original price?

Seymour is twice as old as cassandra. if 16 is added to cassandra’s age and 16 is subtracted from seymour’s age, their ages become equal. what are their present ages? show !

Cody started biking to the park traveling 15 mph, after some time the bike got a flat so cody walked the rest of the way, traveling 4 mph. if the total trip to the park took 6 hours and it was 46 miles away, how long did cody travel at each speed? solve using rate times time= distance