You have to do length of the base x width of the base x height of pyramid
A.
If she will choose 8 from 12 photos, the total number of ways she can choose is given by a combination of 12 choose 8, since the order of the photos doesn't matter.
The formula for a combination of n choose p is:

For n = 12 and p = 8, we have:

So there are 495 ways.
B.
If she wants to arrange the 12 photos, the total number of ways is given by the factorial of 12:

There are 479,001,600 ways.
C.
Since 10 photos already have specific places, we need to calculate the number of ways to arrange the other two photos in the two remaining places.
In this case, there are only 2 ways of organizing the remaining two photos:
Photo 1 first, photo 2 last, or photo 1 last and photo 2 first.
Answer:
Part 1) 
Part 2) The equation satisfy the set of coordinates (see the explanation)
Step-by-step explanation:
step 1
Find the linear equation
The rule for the linear equation states that y is three more than twice x.
so
The variable y is equal to the number 2 multiplied by x plus the number 3

step 2
Prove that the equation satisfies the set of coordinates
substitute the value of x and the value of y in the linear equation and then compare the results
a) (-1, 1)

----> is true
so
The equation satisfy the ordered pair
b) (0, 3)

----> is true
so
The equation satisfy the ordered pair
c) (-1/3,7/3)

----> is true
so
The equation satisfy the ordered pair
therefore
The equation satisfy the set of coordinates
your answer should be c.
A water balloon holds roughly 1.5 oz. of water
and pat has 19 water balloons to fill.
Multiply 1.5 and 19 and you get 28.5, or about 30 oz.
hope i helped!