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den301095 [7]
3 years ago
12

Please help with i am all ready late to turn it in

Mathematics
1 answer:
nekit [7.7K]3 years ago
4 0

Answer:

1.-113

2.62

Step-by-step explanation:

1.-9^2+3(-9)-5

-81+-27-5

-113

2.5(7-(-9))+2(-9)

5*16-18

80-18

62

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A rock outcrop was found to have 95.82% of its parent U- 238 isotope remaining. Approximate the age of the outcrop. The half-lif
mixer [17]

Answer:

A) 277 million years

Step-by-step explanation:

Here, decay of U-238 is first order reaction. (since most of the nuclear decays are first order).

so, the equation t = \frac{1}{k} × ln(\frac{A(0)}{A})

where, t = time from start of reaction

           k = reaction constant

           A(0) = initial concentration; A = present concentration.

     ⇒ 4.5 billion = 4500 million years = \frac{1}{k}× ln2.

Now, given 95.82% of parent U-238 isotope is left.

⇒ t = \frac{1}{k} × ln(\frac{A(0)}{A})

  t = \frac{4500}{ln2} × ln(\frac{100}{95.82})

⇒ t ≅ 277 million years.

5 0
3 years ago
WRITE AN EQUATION TO DESCRIBE THE RELATIONSHIP BETWEEN J AND Mj | 4 | 12 | 20m | 3 | 9 | 15
galina1969 [7]

First, we can use the points (4,3) and (20,15) to find the slope of the line:

\begin{gathered} s=\frac{m_2─m_1}{j_2─j_1}=\frac{15─3}{20─4}=\frac{12}{16}=\frac{3}{4} \\ s=\frac{3}{4} \end{gathered}

Now we can find the relation function using the point (4,3) and the slope s=3/4

\begin{gathered} m─m_1=s(j─j_1) \\ \Rightarrow m─3=\frac{3}{4}(j─4)=\frac{3}{4}j─(\frac{12}{4})=\frac{3}{4}j─3 \\ m=\frac{3}{4}j \end{gathered}

therefore, the equation to describe the relationship between J and M is m=3/4j

4 0
1 year ago
39 is<br> % of 26.<br> WHATS THE ANSWER
Ira Lisetskai [31]

Answer:

150%

Step-by-step explanation:

To find percentage, divide one number by the other.

39/26 = 1.5

1.5 written as a percentage is 150%

5 0
3 years ago
Read 2 more answers
Find the length of the missing side
OLga [1]

a^2+b^2=c^2

a^2+24^2=25^2

a^2+576=625

a^2=49

a=7

The answer is 7.

4 0
3 years ago
Read 2 more answers
A newspaper reporter says that a company made 700,000 profit last year it says this was 12% more then the year before . Work out
Dmitriy789 [7]

Answer:

625000

Step-by-step explanation:

x+12%= 700000

x*1.12=700000

x=700000/1.12

x=625000

4 0
3 years ago
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