Find the sum. Express the answer in scientific notation.
(6.8 x 103) + (2.6 x 105)

 multiply the numbers---  

700.4+(2.6*105) = 700.4+273

973.4  the answer

i leave the calculator work to you.

7. diameter 4 miles, circumference 4π miles

8. radius 0.2 miles, circumference 0.4π miles

[this is a bad problem because the actual radius of a car on the track is less than 0.2 miles so the answer is less than 0.4π miles]

9. radius 6 feet, circumference 12π feet

10. diameter 14 cm, circumference 14π cm

11. diameter 4.8 feet, circumference 4.8π feet

don't know what that says sorry i can't you

step-by-step explanation:

idk what it says