Adjacent angles ABD and DBC. The measure of angle DBC is 40 degrees.

If m∠ABC = 70°, what is m∠ABD? Justify your reasoning.

Using the addition property of equality, 40 + 70 = 110, so m∠ABD = 110°.
Using the subtraction property of equality, 70 − 30 = 40, so m∠ABD = 30°.
Using the Angle Addition Postulate, 40 + m∠ABD = 70. So, m∠ABD = 30° using the subtraction property of equality.
Using the Angle Addition Postulate, 40 + 70 = m∠ABD. So, m∠ABD = 110° using the addition property of equality.

Need to finish my juan wants to build a greenhouse in his back yard. he needs to maximize the ratio of floor area to structure volume in order to provide the most room for plants while minimizing the area to be heated. find the description of the structure that best meets juan’s criteria. a.) a hemisphere with a diameter of 12 feet b.) a cube with a side length of 12 feet c.) a cone with a diameter of 12 feet and a height of 10 feet d.) a square pyramid with a base side length of 12 feet and a height of 9 feet