What ordered pair is the reflection of (5,−8) across the x-axis and the y-axis?
,-8)
,8)
,5)
d.(8,-5)

Option A - (-5,-8) ordered pair is the reflection of (5,−8) across the  the y-axis.

Step-by-step explanation:

To find : What ordered pair is the reflection of (5,−8) across the x-axis and the y-axis?

Solution :

Reflection across x-axis - the x value stay the same and y value changes sign i.e. (x,y)→(x,-y).

So, (5,-8)→(5,8)

Reflection across y-axis - the y value stay the same and x value changes sign i.e. (x,y)→(-x,y).

So, (5,-8)→(-5,-8)

Therefore, option A - (-5,-8) ordered pair is the reflection of (5,−8) across the  the y-axis.

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)