Without operational signs, I'm just guessing but if k = 2, 20 + k = 22
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The answer is 10. let the number be k its given that 200% of that number is 20 In symbolic form, 200% of k = 20 200 per cent of k = 20 200/100 of k = 20 200/100 x k = 20 [of indicates multiplication] 2 x k = 20 k = 20/2 k = 10
k and -k right? -k x -1 =k k+k= 2 k= 1 unless you mean multiply then that would be -k x-1 =k k x k= 2 1.4142 rounded to the nearest ten thousandth
It means 20 karat gold
2 k^2 - k - 4 = 0 2 (k^2 - (1/2)k - 2) = 0 2 ((k - 1/4)^2 - 1/16 - 2) = 0 2 ((k - 1/4)^2 - 33/16) = 0 2 (k - 1/4 - sqrt(33)/4)(k - 1/4 + sqrt(33)/4) = 0 32 (4k - 1 - sqrt(33))(4k - 1 + sqrt(33)) = 0
k/2 -k/5 -k/6 = 2 Multply all terms by 30: 15k -6k -5k = 60 4k = 60 k = 15