What is a adjacent angles???

100 points, hi, i’m not sure how to get the equation from the graph and table.

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.

Evaluate cos2θ for cosθ = square root of 3/2