Find all the second partial derivatives. f(x, y) = sin2(mx + ny)

Three children each had the same amount of money in their savings account. one of the children withdrew three quarters of her moneyand spent it all on a $100 sports jersey. what was the total amount of money originally in the accounts?

What is the length of bc ? enter your answer in the box.bc =

Find the slope and the y-intercept if there's one and the equation of the line given these two points( 3, 2) and( 3, -4)