Last question of the section

SA of black base: 84 cm^2

SA of blue faces: 84 cm^2

SA of gold faces: 60.2 cm^2

SA of 1 ornament: 228.2 cm^2

SA of 100 ornaments: 22,820 cm^2

Step-by-step explanation:

SA of black base:

A = lw

A = 7(12)

A = 84 cm^2

SA of blue faces:

A = bh

(don't divide by 2 since there are 2 triangles)

A = 12(7)

A = 84 cm^2

SA of gold faces:

A = 7(8.6)

(don't divide by 2 since there are 2 triangles)

A = 60.2 cm^2

SA of 1 ornament:

Add #s in bold:

84 + 84 + 60.2 = 228.2 cm^2

SA of 100 ornaments:

Multiply SA of 1 ornament by 100:

228.2(100) = 22,820 cm^2

i believe the correct answer is b.