The midpoint of PQ is at (6,5) and point P is at (4,9).
What are the coordinates of point Q?

B. (8, 1)

Step-by-step explanation:

Given M(6, 5) as midpoint of PQ, and P(4, 9),

let

Rewrite the equation to find the coordinates of Q (x1, y1):

and

Solve for each:

Multiply both sides by 2

Subtract 4 from both sides

Multiply both sides by 2

Subtract 9 from both sides

Coordinates of Q is (8, 1)

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)