Five numbers have an average of 16. if the first four numbers have a sum of 68, what is the fifth number

Find sum of 5 numbers:

Average of 5 numbers = 16

Sum of 5 numbers = 16 x 5 = 80

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Sum of 4 numbers = 68 (Given)

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Find 5th number:

5th number = 80 - 68 = 12

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The fifth number is 12

a complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x2 = −1. because no real number satisfies this equation, i is called an imaginary number. has no real solution, since the square of a real number cannot be negative.

she would want to sell 10 full-year subscriptions and at least 9 half-year subscriptions to get a total of at least $300. 

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