Given the diagram below, what is cos(45)?

A) cos(45) =.

Step-by-step explanation:

Given : A triangle 90 - 45-45 with perpendicular side 9.

To find : what is cos(45)?

Solution : We have given that triangle 90 - 45-45 with perpendicular side 9.

By the triangle 90 - 45-45 rule : adjacent side is same as opposite side and hypotenuse is √2 times of adjacent side.

Then adjacent side = 9

Hypotenuse = 9 .

Then cos(45) = .

cos(45) =  

cos(45) =

Therefore, A) cos(45) = .

it is a. 4.2 because 7.6-3.4 gets the remaining length of 4.2. i might be wrong but i am pretty sure this is the answer.

y=3n + 1

step-by-step explanation:

this is wrong because it says the second number is one less and i added one instead