Fill in the blank:543+529=?+530 i need to fill in the blank pls help​

Lance lived in portugal and brazil for a total of 14 months to learn portuguese. he learned an average of 130 new words per month when he lived in portugal, and an average of 150 new words per month when he lived in brazil. in total he learned 1920 new words. write a system of equations to represent the situation. use x to represent portugal, and y to represent brazil

Atransformation t : (x,y) (x-5,y +3) the image of a(2,-1) is

Which equation can be used to measure the density of water in a spherical water tank? let w represent the number of water particles within the region.