This Math quiz is called 'Exponents - Add and Subtract' and it has been written by teachers to help you if you are studying the subject at middle school. Playing educational quizzes is a fabulous way to learn if you are in the 6th, 7th or 8th grade - aged 11 to 14.
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An exponent is a small superscript number that tells you how many times a number is multiplied by itself. For example, if you have the number 4 and you want to multiply it by itself five times you could write it out as follows:
4 x 4 x 4 x 4 x 4 =
6 x 6 = 36 x 6 = 216
5 x 5 = 25 x 5 = 125 x 5 = 625
3 x 3 = 9 x 3 = 27 x 3 = 81 x 3 = 243
216 + 625 = 841 - 243= 598
63 + 54 - 35 = 598
Answer (b), therefore, shows the correct Order of Operation