Pls hurry I have to turn this in rn What is the y-coordinate of the image of point (-3,7) after a reflection in the x-axis?

Use set builder notation to represent the following set: { -3, -2, -1, 0}

What is the total surface area of this square pyramid?

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?