Two high speed ferries leave at the same time from a city to go to the same island. the first ferry, the cat, travels at 35 miles per hour. the second ferry, the bird, travels at 28 miles per hour. in how many hours will the two ferries be 28 miles apart?

Cat 35 mph  

Bird 27 mph

Same direction in a straight line  

Catch up speed= 35-28=7

Time=d/r

T=28/7=4 hour

answer: what do you mean

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15