27 miles. Because in one hour he does 3 miles so in 9 hours he does 27
Answer:
no solution
Step-by-step explanation:
Equating the right sides of both equations, that is
6x + 9 = 6x + 2 ( subtract 9 from both sides )
6x = 6x - 7 ( subtract 6x from both sides )
0 = - 7 ← not possible
This indicates there is no solution to the system of equations
Answer:
The runner’s time is 3.18 minutes
Step-by-step explanation:
Mathematically;
z-score = (x-mean)/SD
In this question, we have the z-score but we want to calculate x
From the question
z-score = -1.76
mean = 4.5 minutes
SD = 0.75 minutes
x = ?
Substituting these values, we have that
-1.76 = (x-4.5)/0.75
0.75(-1.76) = x - 4.5
-1.32 = x - 4.5
x = 4.5 -1.32
x = 3.18
