A student found the surface area of this pyramid. Surface area = (12)(6) + 1 2 (12)(8) + 1 2 (6)(9.5) = 72 + 48 + 28.5 = 148.5cm² What error did the student make? The student should have used the same value for all of the triangular faces. The student added only three of the five faces. The student did not use the correct formula to find the area of the triangular faces. The student did not find the correct area of the rectangular base.

The answer is, The student added only three of the five faces.

Step-by-step explanation:

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see explanation

step-by-step explanation:

since the sequence is geometric there is a common ratio r between consecutive terms, that is

r = 4 ÷ - 2 = - 2

r = - 8 ÷ 4 = - 2

r = 16 ÷ 8 = - 2

the next term - 13 must be incorrect as it should be - 32 for the sequence to be geometric.

the first 4 terms are therefore geometric with common ratio r = - 2