An exam is made of two papers that score differently. paper 1 has 120 marks. paper 2 has 80 marks. maryam scores: 65% on paper 1 80% on paper 2 work out maryam total percentage score for the exam. you must show your working

71 %

Calculate score for each paper, total them and convert to a percentage.

Paper 1 : mark = 0.65 × 120 =78

Paper 2 :mark = 0.8 ×80 = 64

Total mark = (78 + 64)/200 =142/200

Percentage score = 142/200 × 100 % = 71 %

Maryam TOTAL percentage score for the exam is:

                             71%

Paper--1

 Total marks=120 marks.

The percent score scored by Maryam is:  65%

This means that the score scored by Maryam is: 0.65×120=78

Paper--2

   Total marks=80

The percent score scored by Maryam is:  80%

This means that the score scored by Maryam is: 0.80×80=64

Hence, Total marks of both the paper are: 120+80=200 marks

Marks scored by Maryam in both the subjects is: 78+64=142 marks

Hence, Total percentage score for the exam is:

           Hence, her total percent score is:

                         71%

step-by-step explanation:

the largest number of the four options is 1.8 x 10-2

you have it in scientific notation.

1.80 x 10-6   = 0.00000180

1.80 x 10-4   = 0.000180 (bigger, or "less small", than the former one)

so

1.8 x 10-2       = 0.0180. as you see. the "less small", or the biggest one of them all.

as you have negative exponent, it means you are dividing 1.8 by 100 (i.e. moving the dot towards left, two times).

if you had positive exponent for the scientific notation, power of tenths, you would be multiplying times 100 (moving the dot towards right) as below:

1.8 x (10)2 = 180

so. if you have negative exponent in scientific notation, move the dot toward left. if it is positive, toward right as many times the exponent tells you.