Alright, so 9^(-1/2) would mean that we have 1/(9^(1/2)). Since 9^(1/2) is the square root of 9 (1/3 would be the cube root, etc.), we have 1/sqrt(9)=1/3. For 3/(1/3), we have (3/1)/(1/3), which is (3/1)*(3/1)=9. Squaring 9, we get the cube root of 81 which is around 4.3
2 hours : 6 km
3 hours : 9 km
3.5 hours : 10.5 km
Answer: PR = 14
explanation: 11+3
To add or subtract you do what you would normally do then put
the decimal in the answer
to multiply you multiply the numbers then add the demical places from both
numbers then put the decimal there