The answerand how to do it

Mathematics

1 answer:

AlladinOne [14]3 years ago

3 0

Xian = 56 stamps + 12 per month : 12m + 56
kai = 80 stamps + 8 per month : 8m + 80

when will they have same number of stamps ? set them equal.
m = number of months

12m + 56 = 8m + 80
12m - 8m = 80 - 56
4m = 24
m = 24/4
m = 6.....at 6 months, they will have the same number of stamps.
12m + 56 = 12(6) + 56 = 128
8m + 80 = 8(6) + 80 = 128
They will both have 128 stamps

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Using <span>De Moivre's formula
</span>
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Part (2)

The angle 135° in the second quadrant ⇒ sin is (+) and cos is (-)
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option (3) ⇒⇒⇒ - 243(√2)/2 + 243 (√2)/2 i     ⇒⇒⇒⇒ standard form

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