If you mean n times 7 equals 56... Then the value of n is 8 !
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23 *n=568*n=56n=56/8n=7
21x21 equals 7x7x9
That's a total of 378
n2 = 10n + 56 Subtract (10n + 56) from each side: n2 - 10n - 56 = 0 Now you have something on the left side that you can factor: (n - 14) (n + 4) = 0 n = +14 n = - 4
24 x7 =168 hours