An elevator begins on the ground floor of a hotel. It travels up 18 floors, down 9 floors, up 5 floors, and down 3 floors. What integer represents the change in the number of floors it must now make in order to return to the ground floor?

An alien has just landed from the planet, iksnimak. he would like to leam how to add two fractions when thedenominators are the same. write a paragraph that explains to our alien friend, in your own words, the detailsabout how to add the fractions, how to change the result to a mixed number, and how to reduce the fractionpart. use this problem as your example: the two fractions are 5/8 & 7/8

Answer this 30 points and brainliest!

Solve the system of equations. y= 2x y= x^2 - 15