Solve for y: log of (y – 7) to the base of 4 = 3
a) 71
b) 57
c) 88
d) 74
2007-03-23 03:55:43 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
I see you asking a lot of questions on log.Your homework?
If log confuses you, just remember this "Log of 100 to base 10 is
2"
10^2=100
Now in your question 100=>(y-7), 10=>4 2=>3
Therefore 4^3=y-7
(4*4*4)=y-7
64=y-7
64+7=y-7+7
71=y//
2007-03-23 04:07:20 · answer #1 · answered by Lonewolf 2 · 0⤊ 0⤋
To undo log you power the base so
log(y - 7) base4 = 3 ---> y - 7 = 4^3.
You should be able to finish it now.
2007-03-23 11:04:16 · answer #2 · answered by mathsmanretired 7 · 0⤊ 0⤋
log 4 (y - 7) = 3
(y - 7) = 4^(3) = 64
y = 71
ANSWER a)
2007-03-23 14:56:33 · answer #3 · answered by Como 7 · 0⤊ 0⤋
So 4^3 = (y-7). Solve away...
2007-03-23 11:04:24 · answer #4 · answered by Anonymous · 0⤊ 0⤋
y-7=4^3
y-7=64
y=71
The answer is a.
2007-03-23 11:34:59 · answer #5 · answered by Anonymous · 0⤊ 0⤋