Find the value of K so that 4x+Ky=15 makes an angle of 60° with y-axis​

When you answer this can you explain

Pyotr tchaikovsky sporting goods operates on a 45% overhead based on the selling price, which results in an overhead of $65.34 on the newest version of an air hockey game set. if the air hockey game set costs pyotr tchaikovsky sports $49.32, find the selling price, the markup, and the net profit.

What expression is equivalent to log3(x+4)