Suppose there is an airplane 2500m above sea level and a submarine 394 m below sea level. Using sea level as your reference point, represent these altitudes using positive and negative integers.

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

60 2(x + 2) in the diagram, gef and hef are congruent. what is the value of x?

Acomputer store buys a computer system at a cost of $370.80. the selling price was first at $ 618, but then the store advertised a 20 % markdown on the system. answer parts a and b. a. find the current sale price.