I thought of a number. I added 3 to it, and then divided the result by 7, and I got 11. What was my number?

What number should be added to both sides of the equation to complete this square? x^2-10x=7

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!

What is the frequency of the sinusoidal graph?