12/13 correct is a 92% which is an A-
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If u get 1-5 wrong A 5-10 wrong B 10-15 wrong C 15-20 wrong D 20 and up u get a F
90% still good :D
the reciprocal (aka multiplicative inverse) of a number is 1/number, so the reciprocal of -13 is -1/13 (I moved the negative from the 13 to the 1 as per convention, 1/-13 = -1/13). The reciprocal of any number is what you have to multiply that number by to yield 1. -13 * -1/13 = (-13*-1)/13 = 13/13 = 1
easy 2+2=4 It depends what grade you are in.
It means add the two numbers together. 1 + 13 = 14 13 + 1 = 14 13 +1 14 ===