The pair of points is on the graph of an inverse variation. find the missing value.

(5, 4) and (x, 7)

The missing value of

Step-by-step explanation:  

The inverse variation is given by:  

Now convert this into an equation we must multiply the constant variation k we get,

To find the value of k;

use the coordinates (5,4) , where x =5 and y =4

then,

or

On Simplify, we get:

k = 20

the equation become:  

When y =7 we have;

(x ,7) =

therefore, the missing value x is,

i really dont know

step-by-step explanation:

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)