A community for students.
Here's the question you clicked on:
 0 viewing
remidia
 3 years ago
Solve for x algebraically in 7^(x+2) = 0.005, rounding your answers to three signicant digits.
A) 4.32
B) 4.72
C) 5.12
D) 5.52
E) 5.92
remidia
 3 years ago
Solve for x algebraically in 7^(x+2) = 0.005, rounding your answers to three signicant digits. A) 4.32 B) 4.72 C) 5.12 D) 5.52 E) 5.92

This Question is Closed

him1618
 3 years ago
Best ResponseYou've already chosen the best response.0take log to base 7 on both sides 2x = log 0.005 to base 7

him1618
 3 years ago
Best ResponseYou've already chosen the best response.0use the base change formula then

polpak
 3 years ago
Best ResponseYou've already chosen the best response.0I don't know why you've posted 3 times this same equation

polpak
 3 years ago
Best ResponseYou've already chosen the best response.0Particularly, since people were helping you in the previous two versions

polpak
 3 years ago
Best ResponseYou've already chosen the best response.0aama100: that's some impressive calculator work. If only your tutoring skills were that good people might actually learn something.

remidia
 3 years ago
Best ResponseYou've already chosen the best response.0Thank you him1618, I understand what I was supposed to do now. Its easier for me to figure out math when I see the equation in front of me because I am a visual learner.

polpak
 3 years ago
Best ResponseYou've already chosen the best response.0You can just use the base 10 log and you end up with the same thing \[log(7^{x2}) = log(5/1000)\] \[\implies (x2)log(7) = log(5)  log(1000)\] \[\implies x2 = \frac{log(5)  3}{log(7)} \implies x = \frac{log(5)  3}{log(7)} + 2\]
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.