Which is the correct formula for the function?

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

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

Kendra had twice as much money as kareem. kendra later spent $8 and kareem earned $6. by then,the two had the same amount of money. how much money did each have originally?