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ipn [44]
3 years ago
11

A radioactive isotope has a half life of 4.51 days. If 12.63 grams are now present, how much will be left after 15

Mathematics
1 answer:
Marizza181 [45]3 years ago
7 0

Answer:

Step-by-step explanation:

f=ir^t\\ \\ \frac{1}{2}=r^{4.51}\\ \\ ln(0.5)=4.51lnr\\ \\ r=e^{\frac{ln0.5}{4.51}}\\ \\ r\approx 0.8575\\ \\ f(15)=12.63(0.8575^{15}\\ \\ f(15)\approx 1.26g

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At age 35 you start saving for retirement. If your investment plan pays an APR of 6% and you want to have $1.5 million when you
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Write a system of equations to describe the situation below, solve using any method, and fill in the blanks.
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Answer:

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Step-by-step explanation:

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3 years ago
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Solve the equation.<br> -9x + 1=-X+17<br> Ox=-8<br> Ox=-2<br> Ox=2<br> Ox=8
Reptile [31]

Answer:

x = -2

General Formulas and Concepts:

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right

<u>Algebra I</u>

  • Equality Properties

Step-by-step explanation:

<u>Step 1: Define</u>

-9x + 1 = -x + 17

<u>Step 2: Solve for </u><em><u>x</u></em>

  1. Add 9x on both sides:                    1 = 8x + 17
  2. Subtract 17 on both sides:              -16 = 8x
  3. Divide 8 on both sides:                  -2 = x
  4. Rewrite:                                           x = -2
7 0
3 years ago
The model represents a polynomial of the form ax2 + bx + c. Which equation is represented by the model?
Maru [420]

Consider the given table.

  • The first row represents first term (first brackets):

                                +x+x+x-1=3x-1

  • The first column represents second term (second brackets):

                                +x-1=x-1

  • The product of (3x-1) and (x-1) is equal to the sum of all remaining terms in this table:

                               +x²+x²+x²-x-x-x-x+1=3x²-4x+1.

Therefore, 3x²-4x+1=(3x-1)(x-1).

Answer: correct choice is C.

5 0
3 years ago
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