What is the shape formed by a vertical cross-section through the vertex of the pyramid in the image?
O Circle
O Triangle
O Rectangle
O Trapezoid

Sorry about the first time

Answer is in the file below

tinyurl.com/wpazsebu

include a picture of the drawing in order for me to

step-by-step explanation:

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -