Geometry b unit 6: surface area and volume, lesson 10: surface area and volume unit test? the first question on this test is "use euler's formula to find the missing number. vertices: 13 edges: 26 faces: ? with the answer options a. 14 b. 15 c. 16 d. 17 (i only showed to first question so someone would give me the correct answers.)

The correct option is (B) 15

Euler's formula states the relationship between the number of Faces, Edges and Vertices of any polyhedron. It is given as

where

From the question

so

Learn more about Euler's formula here: link

B

Step-by-step explanation:

Euler's formula for polyhedra states that

F + V - E = 2

where F is faces, V is vertices and E is edges

Substitute the values given and solve for F, that is

F + 13 - 26 = 2

F - 13 = 2 ( add 13 to both sides )

F = 15 → B

correct choice is b

step-by-step explanation:

when you calculate the average rate of change of a function, you are finding the slope of the secant line between the two points. for the function the average rate of change from point to point can be calculated as

to find the average rate of change from day 2 to day 10, note that at day 2, 8 houses were sold, so a(2,8) and at day 10, 2 houses were sold, so b(10,2). thus,