sarah123154 sarah123154

15-08-2019
Mathematics

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Please help!! This is very urgent

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Аноним Аноним

15-08-2019

Answer:

11.75.

Step-by-step explanation:

This is a right angled triangle so we can use a trigonometric function.

cos 40 = 9 /x

x = 9 / cos 40

= 11.75.

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