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leonid [27]
3 years ago
13

Polygon ABCDE is the first in a pattern for a high school art project. The polygon is transformed so that the image of A’ is at

(-4,2) and the image of D’ is at (-2,1). Which transformation can be used to show that ABCDE and its image are congruent?
Mathematics
1 answer:
djyliett [7]3 years ago
7 0

Answer:

4.21

Step-by-step explanation:

Because 2.1 is also equivalent to  -4.2 which also is equivalent to D'.

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3 years ago
The half-life of lead is 22 years. How long will it take for a sample of this substance t decay to 80% of its original amount?
Svetlanka [38]

Answer: 7 years

Step-by-step explanation:

t_{\frac{1}{2} } = In2 / ∧

since the half life is given , we have :

22 = In 2/ ∧

∧ = In2/22

∧ = 0.032

Recall the formula for half life:

\frac{N(t)}{N(0)} = e^{-∧t}

Therefore:

0.80 = e^{-0.032t}

Take the In of both sides

In 0.80 = - 0.032t

t = In 0.80 / - 0.032

t = 7 years

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24. Find the slope and y-intercept of the line.<br> Y=7/5x-3
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Answer:

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slope = m = 7/5

y-intercept = b = -3

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2 years ago
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