Consider the following utility function: U=10X+20Y A consumer faces prices of Px = 2$ and Py =10$
Assuming that graphically good X is on the horizontal axis and good Y is on the vertical axis, suppose the consumer chooses to consume 17 units of good X and 7 units of good Y. Then the marginal rate of substitution (MRS) is equal to:
MRS=?
(Enter your response rounded to two decimal places. Do not forget to include the negative sign.)
The consumer should consume only good X Or only good Y OR the same amount of good X and Y
to maximize utility.

Really need on these. i have no idea what to do

The avenues in a particular city run north to south and are numbered consecutively with 1st avenue at the western border of the city. the streets in the city run east to west and are numbered consecutively with 1st street at the southern border of the city. for a festival, the city is not allowing cars to park in a rectangular region bordered by 5th avenue to the west. 9th avenue to the east, 4th street to the south, and 6th street to the north. if x is the avenue number and yis the street number, which of the following systems describes the region in which cars are not allowed to park? 5th ave 9th ave

The figure below shows rectangle abcd and the triangle eca on a coordinate plane.which of the following expressions represents the perimeter of triangle of triangle eca in units