Brian had k dollars to begin with. he just spent 39 dollars. using k, write an expression for the number of dollars he has left.

K-39  hope I understood the problem right but I hope this helped :)

The Expression: k-39

The Explanation: The reason you write k is because k is a unknown value that is why you keep it the same. Then you write -39 because he spends 39 dollars.

Hope This Helps Please Give Me Brainiest.

answer

d. 10

explanation

the distance from point y to wx is the height of the triangle.

using pythagoras theorem,

group similar terms to get,

this implies that,

take positive square root of both sides to get,

this implies that,