What is the correct reason for statement 5?

prove: k + 4 + 6(1 + k) = 11k + 10

statements reasons
1. k + 4 + 6(1 + k) 1. given
2. k + 4 + (6+ 6k) 2. distributive property
3. k + (4 + 6) + 6k 3. associative property
4. k + 10 + 6k 4. addition
5. k + 6k + 10 5.
6. 7k + 10 6. addition

multiplication

commutative property

associative property

addition

At wind speeds above 1000 centimeters per second (cm/sec), significant sand-moving events begin to occur. wind speeds below 1000 cm/sec deposit sand and wind speeds above 1000 cm/sec move sand to new locations. the cyclic nature of wind and moving sand determines the shape and location of large dunes. at a test site, the prevailing direction of the wind did not change noticeably. however, the velocity did change. fifty-nine wind speed readings gave an average velocity of x = 1075 cm/sec. based on long-term experience, σ can be assumed to be 245 cm/sec. (a) find a 95% confidence interval for the population mean wind speed at this site. (round your answers to the nearest whole number.) lower limit cm/sec upper limit cm/sec