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pogonyaev
3 years ago
9

5. The point (-2, -3) is rotated 90 degrees counterclockwise using center (0, 0).

Mathematics
2 answers:
SSSSS [86.1K]3 years ago
7 0

B. (−3, 2)

I think

so plz have a good rest of ur day

34kurt3 years ago
3 0
Answer C

Reflected across the y-axis changes the x- coordinate and the y- coordination remains the same

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(1)
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How long will it take for 2 g of a sample of iodine-131, which has a half-life of about 8 days, to decay to 0.04 g?
Zigmanuir [339]
We know that

<span>This problem can be represented through the following equation
</span>
A = A₀(1/2)^t/h
where
A----------->  is the amount of substance left after time t
A₀ ----------> is the original amount---------> 2 g
h------------->  is the half-life-----------> 8 days

for A=0.04 g
t=?
0.04 = 2(1/2)^t/8
0.02 = (1/2)^t/8
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t = 8*ln(0.02)/ln(1/2)
t = 45.15 days

the answer is 45.15 days
6 0
3 years ago
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