The first step is to find the distance from the given point to each of the two foci as follows:
Distance D1:
(D1)^2 = (9-1)^2 + (0-6)^2 = 100
D1 = 10
Distance D2:
(D2)^2 = (11-1)^2 + (6-6)^2 = 100
D2 = 10
The constant sum is the summation of the two distances as follows:
constant sum = D1 + D2 = 10 + 10 = 20
The correct choice is:
a) 20
Answer should be A hope it helps
Step-by-step explanation:
3)


12×10+15y=390
120+15y=390
15y=270
y=18
So 18 adult t-shirts were sold
C + (4 - 3c) - 2 = 0
c + 4 - 3c - 2 = 0
c - 3c + 4 - 2 = 0
-2c + 2 = 0
<u> - 2 - 2</u>
<u>-2c</u> = <u>-2</u>
-2 -2
c = 1