Mary bought some candy. She bought 1 package containing 7 pieces of candy and "z" packages containing 2 pieces each. Write an expression to represent the number of pieces of candy Mary has. Use "z" as your variable.

(1 x 7) + (z x 2)

Step-by-step explanation:

Hope this helps!

The answer is 18.9, i think, because there is a formula for finding the total surface area of such pyramids, but i used the simpler way of finding all the separate areas of each face using this information:

since the base area is 3.9 m2, we could just add that to the total at the end.

since the base edge is 1.5 m and the height is 4m, we could find the area of the face by doing (1.5 times 4)/2 which would give us 3m2. 

Since there are 5 faces(pentagonal), we would multiply 3 times 5, and would get 15m total for all the triangle faces.

so to get the total surface area, you would add 15 + 3.9 (which was the base area) and get 18.9m2

;);) hope this helps