The first two terms of an AP are 5 and 8. How many terms are less than 1000

Josephine has a great garden with and area of 2x2 + x - 6 square feet

The cross-sectional areas of a right triangular prism and a right cylinder are congruent. the right triangular prism has a height of 6 units, and the right cylinder has a height of 6 units. which conclusion can be made from the given information? the volume of the triangular prism is half the volume of the cylinder. the volume of the triangular prism is twice the volume of the cylinder. the volume of the triangular prism is equal to the volume of the cylinder. the volume of the triangular prism is not equal to the volume of the cylinder.

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.