First order the data from least to greatest, then subtract the smallest value from the largest value in the set.
R² - 6r - 8 = 0
r² = 7.12
r = -1.12
It is a rational number because it can be expressed by a quotation or fraction of an integer
4mph
0.4 x 7 mph =2.8 miles - distance run.
Let the required speed =S
[2.8 + 0.8S] / [0.4+0.8] =5, solve for S
S =4 mph - must walk to attain an average of 5 mph, or:
6 miles / 1.2 hours =5 mph
Answer:
16
Step-by-step explanation: