PLL HEL NOWWW At the baseball game, 4 hot dogs and 6 soft drinks cost $34, and 3 hot dogs and 3 soft drinks cost $21. Which system of equations below can be used to determine the price of a hot dog and the price of a soft drink?

(Let x represent the cost of a hot dog and y represent the cost of a soft drink.)
A.
7x + 9y = 55

B.
4x + 3y = 34
6x + 3y = 21

C.
4x + 6y = 34
3x + 3y = 21

D.
4x + 3x = 28
6y + 3y = 27

To find the extreme values of a function f(x. y) on a curve x-x(t), y y(t), treat f as a function of the single variable t and use the chain rule to find where df/dt is zero. in any other single-variable case, the extreme values of f are then found among the values at the critical points (points where df/dt is zero or fails to exist), and endpoints of the parameter domain. find the absolute maximum and minimum values of the following function on the given curves. use the parametric equations x=2cos t, y 2 sin t functions: curves: i) the semicircle x4,y20 i) the quarter circle x2+y-4, x20, y20 b, g(x, y)=xy

He ! a group of farmers planned to clean 80 acres of wheat per day to finish the work on schedule. right before the work started, they received a new piece of machinery that them clean 10 more acres per day than originally planned. as a result of increased productivity in the last day before the deadline they only had to clean 30 acres. how many acres of wheat did the group of farmers have to clean?

With number 11 ( show how you got the answer)