Decide if the function is an exponential growth function or exponential decay function, and describe its end behavior using limits. y=0.8^x

What is the standard form of -5x^2+2x^4-11+x^3+3x

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827

Emmanuel added 888 links per minute to his chain mail. allesia started 202020 minutes after emmanuel and added 131313 links per minute to her chain mail. how long had emmanuel worked when allesia caught up to him, and how many links had he added?