Let the center of this elipse be on the origin and let this elipse be horizontal.
major axis is 10 mi, minor axis is 4 mi
(x^2/5^2)+(y^2/2^2)=1
(x^2/25)+(y^2/4)=1
4x^2+25y^2=100
Answer:
120
Step-by-step explanation:
6 girls can send 60 text messages in 30 minutes, so 60 minutes woudl equal 120
Let’s pick a paperback and a hardback
There are 4 x 6 possible choices
Now pick any three of the remaining 8 books
8C3 = 56
This means there are 4 x 6 x 56 = 1344 selections of 5 books that will contain at least one paperback and one hardback
8C3 means picking 3 from 8 without worrying about order
8C3 = 8 x 7 x 6 / (3 x 2 x 1) = 56
Type A: $20.20 ÷ 10 gal = $2.02 per gal
Type B: $$26.04 ÷ 12 gal = $2.17 per gal
Type C: $ 28.14 ÷ 14 gal = $2.01 per gal
Type D: $30.45 ÷ 15 gal = $2.03 per gal
Type B costs less per gallon.
Hope this helps!!