B=420-76 this is the answer if you were not referring to the 76 as a percent
Shes is wrong because 30% of 80 is 24
Answer:
A = pi * r^2 = pi * 5^2 = 25*pi = 78.54 in²
The answer to this is yes
Do recall that squaring and the *radical sign* cancel each other out... like so:(
)
= a
When you put it that way, it isn't enough :P
(
)
= a
(
)
=?
so you start with
(
)
=
8x+1=25 <-- subtract 1 to both sides
8x=24 <- divide 8 to both sides
x= 3
To find out if it's an extraneous solution ask yourself: It mustn't result in a radical that I like to call... 'illegal'. Plug it into the radicand 8x+1 and make sure you get something that is not a negative number.... so, DO you get a negative number when you plug in x = 3 into the radicand?
(extraneous solution is a invalid solution)
x=3 not extraneous