Notice: Payments for answers will end 4/10/2017. Click for more info.
You have new items in your feed. Click to view.
Question and answer
Q: Suppose a laboratory has a 57 g sample of polonium-210. The half-life of polonium-210 is about 138 days. a. How many half-lives of polonium-210 occur in 276 days? b. How much polonium is in the
sample 276 days later? A. 2; 14.25 g B. 2; 28.5 g C. 3; 7.13 g D. 2; 3,933 g
A: A. 2; 14.25
Get an answer
Original conversation
User: Suppose a laboratory has a 57 g sample of polonium-210. The half-life of polonium-210 is about 138 days. a. How many half-lives of polonium-210 occur in 276 days? b. How much polonium is in the sample 276 days later? A. 2; 14.25 g B. 2; 28.5 g C. 3; 7.13 g D. 2; 3,933 g

Weegy: A. 2; 14.25
Expert answered|rickjames|Points 761|

User: A boat costs $18,550 and decreases in value by 9% per year. How much will the boat be worth after 8 years? A. $8,723.18 B. $18,478.00 C. $7,938.10 D. $36,962.04

Weegy: A. $8,723.
Expert answered|rickjames|Points 761|

User: Simplify the expression. (a^-12 b^-8)/(a^-2 b^-11)

Question
Asked 6/7/2012 11:12:45 AM
Updated 4/26/2014 11:59:22 AM
1 Answer/Comment
New answers
Rating
3
(a^-12 b^-8)/(a^-2 b^-11)
= a^-10 b^3
= b^3/a^10
Added 4/26/2014 11:59:22 AM
This answer has been confirmed as correct and helpful.
Confirmed by jeifunk [4/26/2014 12:05:07 PM]
Comments

There are no comments.

Add an answer or comment
Log in or sign up first.
Questions asked by the same visitor
Find the slope and y-intercept of the line. 18x + 2y = –36
Weegy: .Write y =1/4 x + 6 in standard form using integers. A.4x – y = 24 B.–x + 4y = 24 C.–x – 4y = 24 D.–x + 4y = 6 User: The grocery store sells kumquats for $3.75 a pound and Asian pears for $2.25 a pound. Write an equation in standard form for the weights of kumquats k and Asian pears p that a customer could buy with $22. A. 3.75p + 2.25k = 22 B. 3.75k + 2.25p = 22 C. 3.75 + 2.25 = k D. 3.75k = 2.25p + 22 (More)
Question
Expert Answered
Updated 6/26/2014 4:15:28 PM
2 Answers/Comments
18x + 2y = –36 in y = mx + b form is y = -9x - 18, where m stands for slope. Therefore, the slope is -9.
To find the y-intercept, let x = 0.
y = -9x - 18;
y = -9(0) - 18;
y = 0 - 18 = -18


Slope: -9
Y-intercept: -18
Added 6/26/2014 4:15:28 PM
This answer has been confirmed as correct and helpful.
Solve the system using elimination. 7x + 5y = 15 –6x – 4y = –14 A. (–4, 5) B. (–6, 7) C. (7, –7) D. (5, –4)
Question
Not Answered
Updated 11/24/2014 6:35:54 AM
1 Answer/Comment
The solution set for 7x + 5y = 15, –6x – 4y = –14 is (5, –4).

(7x + 5y = 15) * 6;
42x + 30y = 90;
(–6x – 4y = –14) * 7;
-42x - 28y = -98;
(42x + 30y = 90) + (-42x - 28y = -98);
2y = -2; y = -8/2; y = -4;

7x + 5y = 15;
7x + 5(-4) = 15;
7x - 20 = 15;
7x = 15 + 20;
7x = 35;
x = 35/7; x = 5
Added 11/24/2014 6:35:54 AM
This answer has been confirmed as correct and helpful.
26,992,214 questions answered
*
Get answers from Weegy and a team of really smart lives experts.
S
L
Points 230 [Total 248] Ratings 0 Comments 160 Invitations 7 Offline
S
L
Points 130 [Total 130] Ratings 0 Comments 130 Invitations 0 Offline
S
L
R
Points 105 [Total 256] Ratings 1 Comments 5 Invitations 9 Offline
S
R
L
R
P
R
P
R
Points 66 [Total 734] Ratings 0 Comments 6 Invitations 6 Offline
S
1
L
L
P
R
P
L
P
P
R
P
R
P
R
P
P
Points 60 [Total 13327] Ratings 0 Comments 60 Invitations 0 Online
S
L
1
R
Points 31 [Total 1447] Ratings 2 Comments 11 Invitations 0 Offline
S
Points 20 [Total 20] Ratings 1 Comments 0 Invitations 1 Offline
S
L
Points 10 [Total 187] Ratings 0 Comments 0 Invitations 1 Offline
S
Points 10 [Total 13] Ratings 0 Comments 10 Invitations 0 Offline
S
Points 10 [Total 10] Ratings 0 Comments 0 Invitations 1 Offline
* Excludes moderators and previous
winners (Include)
Home | Contact | Blog | About | Terms | Privacy | © Purple Inc.