-x - y = -9
x - y = 3

An arithmetic series a consists of consecutive integers that are multiples of 4 what is the sum of the first 9 terms of this sequence if the first term is 0

Acompany made a profit of 75000 over a period of 6 years on an initial investment of 15000 what is the annual roi

Grandpa ernie is shrinking! over the past 4 years his height decreased by a total of 2.4 cm.it decreased by the same amount each year. what was the change in grandpa ernie's height each year