If 5x^2 + y^4 = -9 then evaluate the second derivative of y with respect to x (d^2y/dx^2) when x = 2 and y = 1. round your answer to two decimal places. i've tried this, but just can't seem to get it. anyone think they can ? i can get as far as knowing the derivatives 10x and 4y^3, but from there i'm quite lost. if you don't mind explaining the process of the problem as well, that'd be appreciated. you!

To show that polygon abcde is congruent to polygon fghij, a must be used to make the two polygons coincide. a sequence of two transformations that can be used to show that polygon abcde is congruent to polygon fghij is .

(05.02)a farmer has decided to divide his land area in half in order to plant soy and corn. calculate the area of the entire area so he knows how much soil is needed. a parallelogram with a height of 6 yards and side length 9 yards. the height forms a triangle with the slanted side of the rhombus with a base of 2.5 yards. rhombus is split into a soy half and a corn half. each bag of soil covers 40 square yards. how many bags should the farmer purchase?

Dana wants to identify the favorite professional baseball team of people in her community. she stands outside a local sporting goods store and asks every other person who enters, "what is your favorite professional baseball team? " will the results of her survey be valid? explain.