When 8 is added to 1/3 of a number, the result is 23 find the number

Plz ! what is the volume of this pyramid? with numbers of 30cm 14cm 18cm

When you are making a circle graph by hand, how do you convert a number for a part into its corresponding angle measure in the circle graph? when you are making a circle graph by hand, what should you do if one of your angle measures is greater than 180°?

Ireally need subtract and simplify.(-y^2 – 4y - 8) – (-4y^2 – 6y + 3)show your work, ! i will mark you brainliest but you have to show your work.