(x^2)/a^2+(y^2)/b^2=1
a>b
a=6, a^2=36
foci=(a^2-b^2)^(1/2)
4=(36-b^2)^(1/2)
16=36-b^2
b^2=36-16
b^2=20
b=2(5)^(1/2) or (20)^(1/2)
1=(x^2/36)+(y^2/20)
-3.6
just put -9*0.4 & that's the answer. as for showing work i'm not sure
He pays $223.65.
This is because from the equation you know that he pays 29.95+2.00 for one light therefore, if we use x to represent the amount of lights--
X(29.95+2.00)
is an equation you can use to solve for the amount Mr. Davis payed for his lights.
Each box holds 6 shirts
there are 45 shirts
45/6 = 7.5
Since you need a full box to fit the shirts, you will need 8 boxes
8 boxes is the least amount the clerk can use to store the shirts
hope this helps