If he rows with the current, Mishka rows 48 km in 3 hours. If he rows against the current, it takes 4 hours to travel the same distance. Find Mishka's speed and the speed of the current.

Step-by-step explanation:

Let the speed of rowing be r and speed of current be c.

If he rows with the current, Mishka rows 48 km in 3 hours.

        Relative speed = r + c

        Distance = 48 km

        Time = 3 hours

        48 = 3 x ( r+c)

        r + c = 16 eqn 1

If he rows against the current, it takes 4 hours to travel the same distance.

        Relative speed = r - c

        Distance = 48 km

        Time = 4 hours

        48 = 4 x ( r - c)

        r - c = 12 eqn 2

eqn 1 + eqn 2

        2r = 28

          r = 14 km/hr

Substituting in eqn 1

         14 + c = 16

                c = 2 km/hr

Mishka's speed = 14 km/hr

Current speed = 2 km/hr

the answer is b: 18

step-by-step explanation:

use the pythagorean theorem to .

a^2+b^2=c^2

plug 18 for "r"

the 2 legs are 18 and 24

18^2+24^2=c^2

324+576=c^2

900=c^2

c=30

30-12=18

18 is the radius

: )

the first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8