Can someone please help me?

You paid 28.00 for 8 gallons of gasoline. how much would you pay for 15 gallons of gasoline?

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?

Y= 4x + 3 y = - 1 4 x - 5 what is the best description for the lines represented by the equations?