COULD SOMEONE HELP ME WITH C? I NEED TO TURN THIS IN ASAP

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

Which statements describe the solutions to the inequality x< -20 check all that apply. there are infinite solutions. each solution is negative. each solution is positive. the solutions are both positive and negative. the solutions contain only integer values. the solutions contain rational number values.

Billie holiday sells children's clothing for sara vaughn's toddler shop. baby blankets sell for $29.99 after a markup rate based on cost of 109%. find the cost and the markup.