The midpoint of ab is m (-2,-1) if the coordinates of a are (-7,2) what are the coordinates of b

The coordinates of b are: (x, y) = (3, -4)

Step-by-step explanation:

Given

Given that the midpoint of the ab is:

The coordinates of a are:

To determine

The coordinates of b = ?

Let b (x, y) be the coordinates of b.

Given that the midpoint of the ab is m(-2, -1)

Thus,

(x - 7) / 2 = -2,      (y + 2) /2 = -1

now solving

(x - 7) / 2 = -2

(x - 7) = -2 × 2

x - 7 = -4

adding 7 in both sides

x  - 7 + 7 = -4 + 7

x = 3

and solving

(y + 2) /2 = -1

(y + 2) = -1 × 2

y + 2 = -2

subtracting 2 from both sides

y + 2 - 2 = -2 - 2

y = -4

Thus,

The coordinates of b are: (x, y) = (3, -4)

$25

step-by-step explanation:

25 - 4.50 = 20.5

20.5 / 2 = 10.25

10.25 + 10 = 20.25

20.25 - 12.50 = 7.75

therefore the answer is $25 as shown as the first number.