According to the radioactive isotope disintegration model, the remaining mass of the radioactive isotope after 40 years is approximately equal is 129.622 grams.
What is the amount of the mass of a radioactive isotope after a period of 40 years?
The deceasing exponential expression described in the statement models the mass of the radioactive isotope (m), in grams, as a function of time (t), in years, which represents the solution of an ordinary differential equation that represents a simple disintegration.
Now, we need to evaluate the function at t = 40 to find the amount remaining after 40 years:
A(40) = 500 · exp(- 0.028171 · 40)
A(40) = 129.622
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I need help finding an answer, please.
From the given actual height of tower 1083 feet and width 410 feet, the
scale model is equal to 1.98 feet tall.
As given,
Eiffel Tower's actual height = 1083 feet
Eiffel Tower's actual width at base = 410 feet
Scale model's width at base = 0.75 feet
To find: how much tall is the scale model of the Eiffel Tower
Let us assume the height of the scale model of the Eiffel Tower to be x feet
Then by the property of similarity of scale models, ratio of the height of actual Eiffel Tower to its scale model will be equal to the ratio of the width of their base.
=> [tex]\frac{x}{1083} = \frac{0.75}{410}[/tex]
=> x = 1.98 feet
Therefore, the width of the base of the scale model of the Eiffel Tower is 1.98 feet with given actual height and width 1083feet and 410 feet respectively.
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Find the length and width of a rectangle sandbox, where the length is 3 feet longer than it’s width if you are building it with 22 feet of lumber
Let the length be represented by l and the width, w.
The question says that the length is 3 feet longer than the width. This means that
[tex]l=w+3[/tex]The perimeter of a rectangle is given as
[tex]2(w+l)=P[/tex]The perimeter of the sandbox is given as 22 feet.
Substituting the values for the perimeter and the length (w + 3) into the perimeter formula, we have
[tex]2(w+w+3)=22[/tex]Solving, we have
[tex]\begin{gathered} 2(2w+3)=22 \\ 2w+3=\frac{22}{2} \\ 2w=11-3 \\ 2w=8 \\ w=\frac{8}{2} \\ w=4 \end{gathered}[/tex]Now that we have the value for the width, we can calculate the length as
[tex]\begin{gathered} l=w+3 \\ l=4+3 \\ l=7 \end{gathered}[/tex]The length is 7 feet and the width is 4 feet.
I need help with this practice problem solving, having trouble.It is trigonometry.
The period of a function is the distance (x) between the repetion of this fuction.
As can be observed in the figure below:
Then, the period is: 7.5 - 1.5 = 6.
Answer: 6.
X =x² + 6x + 5 = 0b= ] ± √b22-4aaC
We have the following quadratic equation:
[tex]x^2+6x+5=0[/tex]And we have to use the quadratic equation to solve that equation.
1. To find the solutions, we need to start by using the quadratic equation:
[tex]\begin{gathered} x=\frac{-b\pm\sqrt{b^2-4ac}}{2a} \\ \\ \text{ when }ax^2+bx+c=0 \end{gathered}[/tex]2. Identify a, b, and c from the given quadratic equation:
[tex]\begin{gathered} x^2+6x+5=0 \\ \\ a=1,b=6,c=5 \end{gathered}[/tex]3. Apply the quadratic equation:
[tex]\begin{gathered} x=\frac{-b\pm\sqrt{b^2-4ac}}{2a} \\ \\ x=\frac{-6\pm\sqrt{6^2-4(1)(5)}}{2(1)} \\ \\ \\ \end{gathered}[/tex]4. And now, we can develop it as follows:
[tex]\begin{gathered} x=\frac{-6\pm\sqrt{36-20}}{2} \\ \\ x=\frac{-6\pm\sqrt{16}}{2} \\ \\ x=\frac{-6\pm4}{2} \\ \\ \text{ Therefore:} \\ \\ x=\frac{-6+4}{2}=-\frac{2}{2}=-1 \\ \\ x=-1 \\ \\ x=\frac{-6-4}{2}=\frac{-10}{2}=-5 \\ \\ x=-5 \end{gathered}[/tex]Therefore, we finally have two solutions, x = -1, and x = -5.
Then the first step is given by:
[tex]x=\frac{-6\pm\sqrt{6^2-4(1)(5)}}{2(1)}[/tex]
You make an investment of $2250.00 with an absolute change of ―$350.00. What is your investment now
worth and what was the percent change?
1. The investment of $2,250 with an absolute change of -$350 is now worth $1,900.
2. The percentage change in the worth of the investment is -15.56%.
What is a percentage change?A percentage change refers to the percentage difference between the initial value and the current value.
To compute the percentage change, use the absolute change and divide by the initial value, then multiply by 100.
For this investment of $2,250 which is now worth $1,900, there was a percentage change of -15.56%, implying that it has drastically reduced in value.
Initial Investment Cost = $2,250.00
Absolute change in investment value = $350
Current value of investment = $1,900 ($2,250 + $350)
The percentage change = -15.56% (-$350/$2,250 x 100)
Thus, the investment is currently valued at $1,900, having lost $350 in value, which in percentage terms, is -15.56%.
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25 Negative and positive integer equations that equal 36
positive : 1, 2, 3, 4, 6, 9, 12, 18, and 36
negative : -1, -2, -3, -4, -6, -9, -12, -18, and -36
13. The sum of three consecutive
integers is 48. What is the smallest
number in the group?
What is the solution for 2(4x-11)+9 =19
Answer:
x=4
Step-by-step explanation:
Answer:
(2×4x-2×11)+9=19Step-by-step explanation:
Please help me im begging
Let's say x is the number of ounces. Since the cost for each ounce is $0.85 then we can find the cost for the total amount of ounces by multiplying it by the cost of each one:
$0.85 · x
This is not the total cost, since the total cost has an additional of $5.50. Then the total cost is given by
c = $5.50 + $0.85x
Answer: C: c = 0.85x + 5.50Pre calculus
Which is the graph of the following
Answer:
c
Step-by-step explanation:
The function is defined at x=0.
eliminate b.|x|=0 and sin(0)=0, so the graph is continuous at x=0.
eliminate d.The graph of |x| is wrong in a, leaving c.
Cuánto es un entero 1/4 en cm?
Answer:
2.54
Step-by-step explanation:
values around 1/4 inch
The table shows the information about the heights, in cm, of a group of yr11 girls
Elijah is lucky enough to get a rent-controlled apartment for $800 per month. The market rent on such an apartment is $3,000 per month. Elijah herself values the apartment at $2,000 per month, and she’d be quite happy with a regular, $2,000 per month apartment. If she stays in the apartment, how much consumer surplus does she enjoy?
The consumer surplus that Elijah will get based on the information is $1200.
What is consumer surplus?It should be noted that consumer surplus simply means the economic measurement of the benefits that the consumer gets from market competition.
From the information, Elijah is lucky enough to get a rent-controlled apartment for $800 per month and the market rent on such an apartment is $3,000 per month.
Since Elijah herself values the apartment at $2,000 per month, the market surplus will be:
= $2000 - $800
= $1200
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The total charge for your party was $375. Translate this information into an equation using x to represent the number of guests at your party
Answer:
There would be 25 guests at the party.
Step-by-step explanation:
First, subtract $150 from $375
Then, divide the difference by $9
The quotient is the answer
So, [tex]x = 25[/tex] guests at the party
Equation:
[tex]375 - 150 = 225[/tex]
[tex]225 \div 9 = x[/tex]
[tex]x = 25[/tex] guests at the party.
Simple equation:
[tex](375 - 150) \div 9 = x\\x = 25[/tex]
Let f (x) = 3x+4 and g(x) = 4x^2+4x.
After simplifying,
(f∘g)(x) = _____ <---- answer
PLEASE HELP!
It should be noted that the value of (f.g)(x) will be
12x³ + 28x² + 16x.
How to illustrate the information?It should be noted that a function is simply used.to illustrate the relationship between the expressions that's given in the data.
From the information, the following can be illustrated:
f(x) = 3x + 4
g(x) = 4x² + 4x
Therefore, (f.g)(x) will be the multiplication of the variables. This will be illustrated as:
= (3x + 4) × (4x² + 4x)
= 12x³ + 12x² + 16x² + 16x
= 12x³ + 28x² + 16x
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The softball team is selling hats. John bought 3 for $24.00. Stacey bought 5 for $40.00. Jim bought 2 for $16.00.
Why does this verbal description represent a proportional relationship?
The value of the hats bought by John, Stacey, and Jim are $8 per hat. This shows a proportional relationship.
What is a proportional relationship?It should be noted that a proportional relationship is one where it van be expressed as y = kx.
In this case, John bought 3 for $24.00. This will be:
= $24 / 3
= $8 per hat
Stacey bought 5 for $40.00. This will be:
= $40 / 5
= $8 per hat
Jim bought 2 for $16.00. This will be:
= $16/2
= $8 per hat
Therefore, it's a proportional relationship.
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Find the output, d, when the input, t, is 4 for d (t)- 13-4t. d(-2) -
The output of the given equation d (t)- 13-4t. d(-2) when the input is t=4 will be - will be -323
Give an illustration of what is a differential equation?Equations with General Differential. Consider the differential equation y′=3x2, which has a derivative and is an illustration of a differential equation. The variables x and y are related because y is an unidentified function of x. The derivative of y is also on the equation's left-hand side.
What are differential equations used for?The sciences, from which the equations originated and where the solutions found application, were the first to influence the mathematical theory of differential equations.
As the equation says: d(t)=13-4t.d(-2)
First we will calculate d(-2)
d(-2)=13-(4*-2)
d(-2)=21
d(4)=13-4*4*21
d(4)=-323
By this, the Final answer that is output for d would be -323.
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# 13 i
MODELING REAL LIFE The post office and the grocery store are both on the same straight road between the
school and your house. The distance from the school to the post office is 376 yards, the distance from the post office
to your house is 929 yards, and the distance from the grocery store to your house is 513 yards.
a. What is the distance from the post office to the grocery store?
yards
b. What is the distance from the school to your house?
yards
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Answer:
What is the role of ethnocentrism in defining the concept of “progress”
Step-by-step explanation:
Provide the correct reason for the statement in line 2.
Answer:
you can ask to your teacher for help
Slope intercept form for points through (0,-5) and (4,0)
Answer:
y = (5/4)x - 5
Step-by-step explanation:
(0, -5) and (4, 0)
(x₁, y₁) (x₂, y₂)
y₂ - y₁ 0 -(-5) 5
m = ------------- = ------------ = ---------
x₂ - x₁ 4 - 0 4
y - y₁ = m(x - x₁)
y -(-5) = (5/4)(x - 0)
y + 5 = (5/4)x - 0
-5 -5
----------------------------
y = (5/4)x - 5
I hope this helps!
the time it takes to cover the distance between two cities by car varies inversely with the speed of the car the trip takes 12 hours for a car moving at 32 mph how long does the trip take for a car moving at 24 mph
Prove that,if one root of the equation ax^2+bx+c=0 is twice the other,then 2b^2=9ac
The proof of the quadratic equation is represented by the equation 18(m₂)² = 18(m₂)²
What are quadratic equations?Quadratic equations are second-order polynomial equations and they have the form y = ax² + bx + c or y = a(x - h)² + k
How to prove the roots of the quadratic equation?The quadratic equation is given as
ax² + bx + c = 0
From the question, we understand that
One of the roots is twice the other
This means that
m₁ = 2m₂
Where m₁ and m₂ are the roots of the quadratic equation
The quadratic equation is then represented as
(x - m₁) * (x - m₂) = 0
Substitute m₁ = 2m₂ in the equation (x - x₁) * (x - x₂) = 0
So, we have
(x - 2m₂) * (x - m₂) = 0
Expand the brackets
So, we have
x² - 2xm₂ - xm₂ + 2(m₂)² = 0
Evaluate the sum and the difference.
So, we have
x² - 3xm₂ + 2(m2)² = 0
In the above equation, we have
a = 1
b = -3m2
c = 2(m₂)²
Recall that
2b² = 9ac
So, we have
2 * (-3m₂)² = 9 * 1 * 2(m₂)²
Evaluate
18(m₂)² = 18(m₂)²
The above equation is true
Hence, it is true that if one root of the equation ax² + bx + c = 0 is twice the other, then 2b² = 9ac
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PLEASE HELP QUICK!!!!
A candy store sells caramels and milk chocolate by the pound. The table below shows the total cost, in dollars, for a pound of each type of candy the store sells.
Answer:
Conversion of Dollars to Pounds is $1=0.90£
Step-by-step explanation:
b) when you calculate the amount you paid in total for 5 caramels and 4 milk chocolates, the total comes to $97,6 which is close to $100
Hope this helps !!
Write a rule to describe each transformation.
Answer:
reflection over the y-axis
Step-by-step explanation:
Can you please help me out with a question
Area of the green triangle = 81 mm squared
A linear relationship is shown in the graph.
Which equation best represents the relationship between x and y?
(A) The equation y = ( 1/4 )x + 2 best represents the relationship between x and y.
From the graph, we can see that the line is passing through points ( - 8, 0 ) and ( 0, 2 ).
So, to obtain the equation that represents the best relationship we will substitute the points in the equation to check whether they satisfy or not.
Consider option (a),
y = ( 1/4 )x + 2
For ( - 8, 0) :
0 = ( 1/4 ) × - 8 + 2
0 = - 2 + 2
0 = 0
For ( 0, 2 ):
y = ( 1/4 )x + 2
2 = (1/4) × 0 + 2
2 = 2
Hence, the equation y = ( 1/4 )x + 2 passes through both points.
Consider option (b),
y = 4x - 8
For point ( - 8, 0 )
y = 4(-8) - 8
y = - 32 - 8 = - 40 ≠ 0
For point ( 0, 2)
y = 4(0) - 8 = - 8 ≠ 2
Hence, the equation y = 4x - 8 does not pass through the points.
Consider option (c),
y = ( 1/4 )x - 8
For ( - 8, 0 )
y = ( 1/4 ) × - 8 - 8
y = - 2 - 8 = - 10 ≠ 0
For ( 0, 2)
y = ( 1/4 ) × 0 - 8 = - 8 ≠ 2
Hence, the equation y = ( 1/4 )x - 8 does not pass through points.
Consider option (d),
y = 4x + 2
For point ( - 8, 0 )
y = 4( - 8) + 2
y = - 32 + 2 = - 30 ≠ 0
For point ( 0, 2)
y = 4( 0 ) + 2 = 2
2 = 2
Hence, the equation passes through ( 0, 2) but does not pass through the point ( - 8, 0 ).
Therefore, the equation that represents the relationship between x and y is y = ( 1/4 )x + 2
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Find the surface area and volume of the solid. Round each measure to the nearest tenth, if necessary.
The surface area and volume of the given pyramid are 800ft³ and 1280ft³.
What is a pyramid?The following is the general formula to determine the pyramid's surface area and volume: The base area of a pyramid is added to half the product of the base perimeter and slant height to determine its total surface area. The Total Surface Area of the Pyramid is, therefore (1/2)Pl + B square units.So, the formula for the surface area of the Right rectangular pyramid:
[tex]A = lw+l\sqrt{(\frac{w}{2})^{2}+h^{2} } +w\sqrt{(\frac{l}{2} )^{2}+h^{2} }[/tex]Now, l = 16, w = 16 and height = 15 feet.Substitute the values in the formula:(Refer to the image attached below for calculation)
The surface area of the pyramid is 800ft³.
The formula for the volume of the Right rectangular pyramid:
[tex]V = \frac{lwh}{3}[/tex]Now, l = 16, w = 16 and height = 15 feet.Substitute the values in the formula:(Refer to the image attached below for calculation)
The volume of the pyramid is 1280ft³.
Therefore, the surface area and volume of the given pyramid are 800ft³ and 1280ft³.
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7. STEM The male Cuban tree frog is about the size of the
female Cuban tree frog. The average size of the female Cuban
tree frog is shown at the right. What is the size of the male
Cuban tree frog? (Example 4)
Answer:
Step-by-step explanation:
The male Cuban tree frog is about 2/5 the size of the female Cuban tree frog. The average size of the female Cuban tree frog is 6 inches. What is the size
Need help on another one of these problems I'm working on.
we have that
the solution of the given inequality is the interval
(-infinite,2/3) U (1, infinite)
so
Answer part c is
(-infinite,2/3) U (1, infinite)
Part b
In a number line, the solution is the shaded area at the left of x=2/3 (open circle) and the shaded area at the right of x=1 (open circle)
see the figure below to better understand the problem
please give me a minute to draw the solution
if RS equals 59 and ST equals 10x - 31 find x
The chord RS and chord ST subtends equal angles the center. So length of chord ST is equal to length of chord RS.
Determine the value of x.
[tex]\begin{gathered} RS=ST \\ 59=10x-31 \\ 10x=59+31 \\ x=\frac{90}{10} \\ =9 \end{gathered}[/tex]So value of x is 9.