Luisa earns $20 for walking 4dogs. how much would she earn for each dog

The mean of a set of data is -3.82 and its standard deviation is 2.31. find the z score for a value of 3.99.

Campus rentals rents 2 and 3 bedrooms apartments for $700 ans $900 a month respectively. last month they had six vacant apartments and reported $4600 in lost rent. how many of each type of apartment were vacant?

What is the solution to this system of equations? y= 2x - 3.5 x - 2y = -14