south america and africa are drifting apart at a rate of 3.5 cm each year. How far apart will they be in 5,000,000 years

X+ y = 5 ; x - y =3 solve using linear combination

Arestaurant charges $100 to rent its banquet room for an event. it also charges $15 to serve dinner to each guest. write an equation for the total cost of the banquet room in terms of the number of guests. deine your variables. what is the total cost of the banquet room for 20 guests?

Parabolas y=−2x^2 and y=2x^2 +k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.