The radius of the earth is approximately 6400km. the equator is the circle around the earth dividing it into the northern and southern hemisphere. (the center of the earth is also the center of the equator.) what is the length of the equator?

Length of equator = 40212.39 km

Step-by-step explanation:

Length of equator is perimeter of the circle with radius of earth.

Radius of earth = 6400 km

Perimeter of circle = 2πr

Here r = 6400 km

Substituting

          Perimeter of circle = 2πr = 2π x 6400 = 12800π km = 40212.39 km

Length of equator = Perimeter of circle = 40212.39 km

Length of equator = 40212.39 km

2nd one in the first row is correct

37/3

step-by-step explanation:

step 1: simplify both sides of the equation.

7x+8(x+

1

4

)=3(6x−9)−8

7x+(8)(x)+(8)(

1

4

)=(3)(6x)+(3)(−9)+−8(distribute)

7x+8x+2=18x+−27+−8

(7x+8x)+(2)=(18x)+(−27+−8)(combine like terms)

15x+2=18x+−35

15x+2=18x−35

tep 2: subtract 18x from both sides.

15x+2−18x=18x−35−18x

−3x+2=−35

step 3: subtract 2 from both sides.

−3x+2−2=−35−2

−3x=−37

step 4: divide both sides by -3.

−3x

−3

=

−37

−3

x=

37

3