What percentage did you tip if your lunch was 4$ and you left 1$

In the rectangle below ac=30 units what is de

Dakota earned $7.50 in interest in account a and $18.75 in interest in account b after 15 months. if the simple interest rate is 4% for account a and 5% for account b, which account has the greater principal? explain. to make it a little easier, there is an image. good luck!

In the triangle below, what is the length of the side opposite the 60° angle?