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user100 [1]
3 years ago
13

Simplify to create an equivalent expression.

Mathematics
1 answer:
Sergio [31]3 years ago
8 0
This is how I got the answer it’s c

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The half life of radium is 1690 years. if 80 grams are present now, how much will be present in 830 years
Pachacha [2.7K]

Answer:

A(t) = amount remaining in t years

      = A0ekt, where A0 is the initial amount and k is a constant to                     be determined.  

Since A(1690) = (1/2)A0 and A0 = 80,

                we have 40 = 80e1690k

                1/2 = e1690k

                ln(1/2) = 1690k

                k = -0.0004

So, A(t) = 80e-0.0004t

Therefore, A(430) = 80e-0.0004(430)

                           = 80e-0.172

                           ≈ 67.4 g

Step-by-step explanation:

5 0
2 years ago
Which shoes two expressions that are equivalent to (-8)(-12)(2)?
lana [24]

Answer:

the answer is(-8)(-12) l think

6 0
3 years ago
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HELP MEEEE!!!<br><br> which of these graphs do not represent constant rates of change ?
Ganezh [65]

Answer:

Hello! Your answer would be below!

Step-by-step explanation:

Graph B)

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3 0
3 years ago
D/dx(sin x/2+cos x) = (a + b cos x)/(2+cos x)^2 find a and b.​
Talja [164]

Answer:

a = 1 and b = 2

Step-by-step explanation:

Using the Quotient Rule>

d/dx[(sin x)/(2+cos x) ]

=   [(2 + cos x) * cosx -  sin x * - sin x)]  /  (2 + cos x)^2

= 2cos x + cos^2x + sin ^2 x) /  (2 + cos x)^2

But cos^2x + sin^2x = 1 so we have:

(1 +  2 cos x)  /   (2 + cos x)^2

- so a = 1 and b = 2.

7 0
3 years ago
2 + 2 ? what is the answer
julia-pushkina [17]

Answer:

4

Step-by-step explanation:

3 0
3 years ago
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