It's January, they have till July => 6 months including January
half of $8000 is $4000 in 6 months
4000/6 = $666.66 per month
Johnny should save that much money each month
What I can’t see anything
Answer:
The midpoint is (-1, 1.5)
Step-by-step explanation:
To find the x coordinate of the midpoint, average the x coordinates of the endpoints
(2+-4)/2 = -2/2 = -1
To find the y coordinate of the midpoint, average the y coordinates of the endpoints
(-3+6)/2 = 3/2 = 1.5
The midpoint is (-1, 1.5)

It will take approximately 13 seconds.
Answer:
![\text{\bf{A.}}\qquad\left[\begin{array}{ccc}-19&9&-7\\15&-7&6\\-2&1&-1\end{array}\right]](https://tex.z-dn.net/?f=%5Ctext%7B%5Cbf%7BA.%7D%7D%5Cqquad%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D-19%269%26-7%5C%5C15%26-7%266%5C%5C-2%261%26-1%5Cend%7Barray%7D%5Cright%5D)
Step-by-step explanation:
Many scientific and graphing calculators will compute this easily.
The inverse of a square matrix is a square matrix of the same dimensions. That eliminates choices C and D. We can check choices A and B by computing a couple of terms of the product of the given matrix and its "inverse". That product should be the identity matrix, with 1 on the diagonal and 0 elsewhere.
Using matrix A,
(r, c) = (1, 1) = 1(-19) +2(15) +5(-2) = -19 +30 -20 = 1 . . . . correct
(r, c) = (2,3) = 3(-7) +5(6) +9(-1) = -21 +30 =9 = 0 . . . . correct
Using matrix B,
(r, c) = (1, 1) = 1(-19) +2(-2) +5(15) = -19 -4 +75 = 52 . . . . incorrect
Indications are that choice A is appropriate.