To simplify 4/(2+7i), we multiply it by a fraction equal to one that removes the i value in the denominator. The best value to do this is the complex conjugate divided by itself, so we have 4(2-7i)/((2+7i)(2-7i)). Simplifying, we have (8-28i)/(4-(-49))=(8-28i)/53, which is a completely simplified fraction since 8 and 53 are relatively prime (or coprime), and there are no radicals in the denominator.
Answer:
B
Step-by-step explanation:
Since a cube has 6 sides, the surface area of a cube is 6 times the area of one of the sides. Therefore:

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Answer:
43
Step-by-step explanation:
5% of 60 dollars is 3 dollars.