Ask google. Google knows everything... hahaha

Answer: **Total cost of the models the town buy = $1050
**

Solution:

The science museum sells dinosaurs models to the town school and town library for $105 each.

The two library buys 4 models and cost of each model $105

Total cost pay by library = 4x105 = $420

The school buys 6 models and cost of each model $105

Total cost pay by school = 6x105 = 630

We need to calculate total cost of the models the town buys

Total cost = Cost buy library + Cost buy school

Total cost = 420+630

**Total cost = $1050
**

Its 76, because of the included angles all adding up to 360 and stuff, when you add them all together, you get 76!

**Answer: She had $5400 **

**Step-by-step explanation:**

We will let x represent the total amount of money in her pocket .

So we know that 1/3 of x has to equal 1800 because 2/3 of the money is already been spent so 1/3 will of the money will be left.

1/3 * x = 1800 solve for x by divide both sides by 2/3

x=5400

Check.

1/3 * 5400 =1800

This may not help but the first step is to distribute the 2 to the (x - 3) Which would get you to 2x - 3 + y2= 49 Then you will want to subtract 3 from 49 which gives you 46. Now you have 2x+ y2= 49 Now you need you have the standard equation ax+by=c