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3 years ago

I kinda get this problem but i just want to see what other answers people got to see if i did the question wrong.

Mathematics

2 answers:

otez555 [7]3 years ago

8 0

An=a1+d(n-1)
fisrst term is a1
common difference is d

decreases by 4 each time
first term is 19
an=19-4(n-1)
distribute
an=19-4n+4
an=23-4n
you are right

Ulleksa [173]3 years ago

3 0

You did not do the question wrong. Your answer would be correct. ;-)

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Answer:

1) A = 547.1136, C = 82.896

2) A = 678.5226, C = 92.316

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$A = \Pi (\frac{D}{2})^2 = 3.14 * (\frac{26.4}{2})^2 = 3.14 * 13.2^2 = 547.1136$

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$C = \Pi D = 3.14 * 32.8 = 102.992$

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$C = \Pi D = 44.5*3.14 = 139.73$

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$C = 2\Pi r = 2 * 3.14 * 17.8 = 111.784$

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