Can anyone solve this?

5x^2-3+3=0

also is it a quadratic equation?

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

He mass of a single atom of carbon can be found by dividing the atomic mass (12.01 g) by 6.022 x 10^23. which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?

Jimmy can run 3.5 miles in 20 minutes. how far can ne run in one hour and ten minutes?