**Answer:**

Well I can't make a table but I can explain the answer.

**Step-by-step explanation:**

So you have $1,800 on a payment plan. In three months, the balance is 1,350. So 1,800-1,350=450. This means he paid $450 in three months. 450/3 is 150. He pays $150 a month. Then 2 months later, (5 months after purchase) he has balance is $1,050. 1,350-1,050=300. 300/2=150. Further evidence of the fact that he pays 150 dollars a month. This means that the 6th month, he will have $900 dollars left on the payment. 7th month... $850, 8th month... $600, 9th month... $450, 10th month... 300 dollars, 11th month... 150, and 12 month he will have paid off all of his computer. Hope it helps, sorry it is so long. Have a great day! :D

**Answer:**

Zero-elevation surface is a vertical datum that is used to describe a surface, such as that of a planet. The value of this datum is usually adopted by statute. This elevation is used, for example, to build a texture map from an agreed surface, such as a spheroid with dimensions defined by a mean surface gravity.

**Step-by-step explanation:**

Let o represent the obtuse angle, and let the base angle be represented by b. Then you have

.. o = 2.5b

.. o +2b = 180

Substituting the first equation into the second, you have

.. 2.5b +2b = 180

.. 4.5b = 180

.. b = 180/4.5 = 40

.. o = 2.5*40 = 100

The obtuse angle is 100°; the base angles are 40°.