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zalisa [80]
3 years ago
8

You have 960 grams of a radioactive kind of yttrium. How much will be left after 30 hours if

Mathematics
1 answer:
Alika [10]3 years ago
7 0

Answer:

You will have 120g Yttrium remaining

Step-by-step explanation:

Since the half life is 10 hours, and you are required to find out the remaining amount after 30 hours, you can do 30 / 10 = 3.

Yttrium undergoes its half life 3 times in 30 hours.

What you can do is divide the original amount by 2 thrice.

960/2 = 480 (1st half life)

480/2 = 240 (2nd half life)

240/2 = 120 (3rd half life)

You will have 120g Yttrium remaining

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Answer:

397.7 m²

Step-by-step Explanation:

Step 1: find m < W

W = 180 - (33+113) (sum of ∆)

W = 34°

Step 2: find side UV using the law of sines

\frac{UV}{sin(W)} = \frac{VW}{sin(U)}

\frac{UV}{sin(34)} = \frac{29}{sin(33)}

Multiply both sides by sin(34)

\frac{UV}{sin(34)}*sin(34) = \frac{29}{sin(33)}*sin(34)

UV = \frac{29*sin(34)}{sin(33)}

UV = 29.8 m (approximated)

Step 3: find the area using the formula, ½*UV*VW*sin(V)

area = ½*29.8*29*sin(113)

Area = 397.7 m² (rounded to the nearest tenth.

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