Plz help ASAP I can't figure out

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

Pyramid shown has a square base that is 18 inches on each side has a surface area of 164 square inches what is the slant height

If you prove that ∆wxz is congruent to ∆yzx, which general statement best describes what you have proved?