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finlep [7]
3 years ago
9

2. Vertical angles CAN NOT be which of the following?

Mathematics
2 answers:
olganol [36]3 years ago
6 0
Adjacent

Adjacent angles share a common vertex and side while vertical angles are across from each other
Hatshy [7]3 years ago
5 0
Vertical angels cannot be...

Answer: C adjacent
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5x +6y = -6
nadezda [96]

Answer:

(-6,4)

Step-by-step explanation:

If this is the system of equations here is how:

solve for 1 vairuble in the first equation, and plug that it to the other.

3 0
3 years ago
Suppose after 2500 years an initial amount of 1000 grams of a radioactive substance has decayed to 75 grams. What is the half-li
krok68 [10]

Answer:

The correct answer is:

Between 600 and 700 years (B)

Step-by-step explanation:

At a constant decay rate, the half-life of a radioactive substance is the time taken for the substance to decay to half of its original mass. The formula for radioactive exponential decay is given by:

A(t) = A_0 e^{(kt)}\\where:\\A(t) = Amount\ left\ at\ time\ (t) = 75\ grams\\A_0 = initial\ amount = 1000\ grams\\k = decay\ constant\\t = time\ of\ decay = 2500\ years

First, let us calculate the decay constant (k)

75 = 1000 e^{(k2500)}\\dividing\ both\ sides\ by\ 1000\\0.075 = e^{(2500k)}\\taking\ natural\ logarithm\ of\ both\ sides\\In 0.075 = In (e^{2500k})\\In 0.075 = 2500k\\k = \frac{In0.075}{2500}\\ k = \frac{-2.5903}{2500} \\k = - 0.001036

Next, let us calculate the half-life as follows:

\frac{1}{2} A_0 = A_0 e^{(-0.001036t)}\\Dividing\ both\ sides\ by\ A_0\\ \frac{1}{2} = e^{-0.001036t}\\taking\ natural\ logarithm\ of\ both\ sides\\In(0.5) = In (e^{-0.001036t})\\-0.6931 = -0.001036t\\t = \frac{-0.6931}{-0.001036} \\t = 669.02 years\\\therefore t\frac{1}{2}  \approx 669\ years

Therefore the half-life is between 600 and 700 years

5 0
3 years ago
Which of the following represents the sum of the polynomials below?
zysi [14]

Answer:

A

Step-by-step explanation:

First, you have to align the like terms next to each other so that it will be easier to combine like terms. (Like terms have the same variables and powers)

6x^3+(-2x^3)+2x^2+5x^2+9x+3x

Combine like terms:

(When combining like terms all you have to do is add/subtract the coefficients, number in front of variables, and leave the variable and exponents)

6x^3+(-2x^3)= > 6x^3-2x^3=4x^3

2x^2+5x^2=7x^2

9x+3x=12x

So, we get 4x^3+7x^2+12x

3 0
1 year ago
I will give extra points please help
weqwewe [10]

Answer:

7

Step-by-step explanation:

<u>3 </u>+ 4 = 7.

So, therefor, x = 3

6 0
3 years ago
Represents the distance between -12 and -5 on a number line?
aivan3 [116]
7 units between -12 and -5
3 0
3 years ago
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