|x-10| when x = -8
| - 8 - 10 | = |-18| = 18 <==
General equation of parabola
for vertex(h,k)
Now





So
equation of parabola

The given operation involves just swapping the two rows, so carrying out

on the matrix gives
Answer:
t ≥ 18
Step-by-step explanation:
He has run 12 miles plus some more miles t. He need to run at least 30 miles
12+t ≥ 30
Subtract 12 from each side
12+t-12 ≥ 30-12
t ≥ 18