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
Question
Updated 4/26/2014 11:59:22 AM
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

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.

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

Question
Updated 4/26/2014 11:59:22 AM
Rating
3
(a^-12 b^-8)/(a^-2 b^-11)
= a^-10 b^3
= b^3/a^10
Confirmed by jeifunk [4/26/2014 12:05:07 PM]

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
Updated 6/26/2014 4:15:28 PM
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
Solve the system using elimination. 7x + 5y = 15 –6x – 4y = –14 A. (–4, 5) B. (–6, 7) C. (7, –7) D. (5, –4)
Question
Updated 11/24/2014 6:35:54 AM
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
27,193,149
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