In ΔXYZ, the measure of ∠Z=90°, the measure of ∠Y=9°, and YZ = 23 feet. Find the length of XY to the nearest tenth of a foot.

XY = 23.3 ft

Step-by-step explanation:

It helps if you can draw yourself a picture.

You are given right triangle with the adjacent side of the 9° angle and you are looking for the hypotenuse.  

The cos of an angle = adjacent side/hypotnuse

Let h = XY

Then cos 9 = 23/h

h cos 9 = 23

h = 23/cos 9

h = 23.3 ft.

first option

a function is a relation in which an input is paired with exactly one output.

so, let's find the right answer.

in our first option, our inputs are january, february, and march. the outputs are 30, 28, and 25. each input has it's own output. this is correct!

our second option we know is incorrect, because ms. valverade has two outputs, dogs and cats. this is not a function.

our third option is incorrect as well. the yellow square has two ouputs, the square and the triangle.

lastly, in our fourth option, we see the number 7 two times with a different output. therefore, this is not a function.

remember: each input must be paired with only one output!

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step-by-step explanation:

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