can someone tell me if i did this right? I got the answer 15

Find the value of x to the nearest whole number.

http://secure.starssuite.com/files/geo2010/Geom_11S_Fig15.jpg

Question

can someone tell me if i did this right? I got the answer 15

Find the value of x to the nearest whole number. 

http://secure.starssuite.com/files/geo2010/Geom_11S_Fig15.jpg

aum · Answer

How many decimal places they want the answer in?

anonymous · Answer

3

aum · Answer

tan(40) = opposite / adjacent = x / 19
x = 19 * tan(40)

Set your calculator to degree mode (not radians), calculate tan(40), multiply by 19 and round your answer to 3 decimal places.

aum · Answer

Since they want up to 3 decimal places, 15 is not the correct answer.

anonymous · Answer

well i got 15.94 so it would be 16 right?

aum · Answer

You said they wanted the answer up to 3 decimal places.  Look at the 4th decimal place.  If it 5 or more add 1 to the third decimal place and give your answer in the form 15.ddd

aum · Answer

Calculator says 19 * tan(40) = 15.9428929924
4th decimal place is 8 which is $\ge$ 5.
So add 1 to the 3rd decimal place.  So it is 15.943

x = 15.943

anonymous · Answer

oh okay, thnks