You're trying to find constants
such that
. Equivalently, you're looking for the least-square solution to the following matrix equation.
To solve
, multiply both sides by the transpose of
, which introduces an invertible square matrix on the LHS.
Computing this, you'd find that
which means the first choice is correct.
12 plus 12 (walk to and from her grandparents) times 2 (two times a week she goes) equals 48. So, she spends 48 minutes walking between the two houses.
The answer is 120 instead of 12 because 12 equals 7.2
Answer:
12
Step-by-step explanation:
Since it is on a right angle we can equation the sum of both angles to 90:
6x-2+20 = 90
Now we simplify:
6x+18=90
Now we subtract 18 from both sides:
6x+18-18=90-18
Simplify:
6x=72
Now we divide both sides by 6:
6x÷6=72÷6
Simplify:
x = 12
B.
You would first have to add 9 to each side so that the equation equaled 0. Then you could pull these numbers.
