17. In a Year 12 Mathematics examination there are 30 multiple choice questions. A student scores 2 marks for a correct answer, -1 mark for an incorrect answer and zero marks for an unanswered
question.
Mary scores a total of 33 marks in the multiple choice section. How could she have reached this
total?

Please help me with this question, its urgent.
Thank You​

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have

the answer is b.

surface area: 169π

volume: 366π

i got it down.