Helppp
The half-life of Radium-226 is 1590 years. If a sample contains 500 mg, how many mg will remain after 1000 years?---------
Using the exponential decay equation, we can see that after 1000 years we will have 178.43 mg of Ra₂₂₆
How much will remain after 1000 years?The decay of a radioactive substance, such as Radium-226, can be modeled by the exponential decay equation:
N(t) = N₀ * (1/2)^(t / T)
where:
N(t) is the amount of the substance remaining after time t
N₀ is the initial amount of the substance
t is the time elapsed
T is the half-life of the substance
Given that the half-life of Radium-226 is 1590 years and the initial amount is 500 mg, we can plug in these values into the equation and solve for N(1000), which represents the amount remaining after 1000 years.
N(1000) = 500 * (1/2)^(1000 / 1590)
N(1000) ≈ 178.43 mg
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Find the square root of 1681
Answer: The square root of 1681 is 41.
Answer:
41
Step-by-step explanation:
It is 41
41 * 41 = 1681
41 ^ 2 = 1681
-2x-2y=14 slecet all the ordered pairs that are solutions
The ordered pairs of the solutions to the linear expression are В. (-7, 0) C. (0, -7) and F. (3, -4)
What are the ordered pairs of the linear expressionFrom the question, we have the following parameters that can be used in our computation:
The linear expression -2x - 2y =14
To determine the ordered pairs of the linear expression, we set x and y to the values in the list of options and check for the true equation
Using the above as a guide, we have the following:
А. (2, 3) В. (-7, 0) C. (0, -7)
-2(2) - 2(3) = 14
-10 = 14 --- false
-2(-7) - 2(0) = 14
14 = 14 --- true
-2(0) - 2(-7) = 14
14 = 14 --- true
D. (-7, 1) E. (-1, 7) F. (3, -4)
-2(-7) - 2(1) = 14
12 = 14 --- false
-2(-1) - 2(7) = 14
-12 = 14 --- false
2(3) - 2(-4) = 14
14 = 14 --- true
Hence, the ordered pairs of the linear expression are В. (-7, 0) C. (0, -7) and F. (3, -4)
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Complete question
Select all the ordered pairs that are solutions
-2x - 2y = 14
А. (2, 3) В. (-7, 0) C. (0, -7)
D. (-7, 1) E. (-1, 7) F. (3, -4)
At 10.30 a.m, a van left Town X travelling at an average speed of 64 Km/h.
At 11.15 a.m., a car left Town X, travelling on the same road at an average speed of
80 Km/h.
a) At what time did the car catch up with the van?
b) How far from Town X did each vehicle travel when they passed each other?
Answer:
a) 2:15 pm
b) 240 km
Step-by-step explanation:
You want to know the time and place where a car leaving at 11:15 a.m. at 80 km/h catches up with a van leaving at 10:30 a.m. at 64 km/h.
Head startThe van travels for 11:15 -10:30 = :45, or 3/4 hour, before the car starts. This gives it a distance advantage of (3/4 h)(64 km/h) = 48 km.
Closing speedThe speed at which that distance is reduced is the difference between the car speed and the van speed:
80 km/h -64 km/h = 16 km/h
Closing timeThe time it takes for the head-start distance to be reduced to zero is ...
time = distance/speed
time = (48 km)/(16 km/h) = 3 h
a) Meeting timeThree hours after the car leaves, it will catch up with the van. That time is ... 11:15 +3:00 = 14:15 = 2:15 p.m.
b) Meeting distanceIn 3 hours, the car travels (3 h)(80 km/h) = 240 km.
Note that the van has been traveling 3 3/4 hours, so will have also traveled (3 3/4 h)(64 km/h) = 240 km. The two vehicles need to be in the same place at the same time if they are to pass each other.
__
Additional comment
The attached graph shows the two vehicles will have traveled 240 km when they mean at 2:15 pm. The horizontal axis is hours after midnight. The vertical axis is kilometers from town X. The relation graphed is distance = speed × time.
Can you guys help me out?
Step-by-step explanation:
For f(3) 3 is >= 2 so you use the second portion of the function :
f(3) = 5x+2 = 5(3) + 2 = 17
How do l do this please help me asap
Answer:
[tex] {z}^{2} - 10z + 9 = [/tex]
[tex](z - 1)(z - 9)[/tex]
factor the expression
7x^2+12x+5
Hi again
I did it wrong
I'm here to redeem
When you have to factor these types of equations, you have to use a method called slide divide and bottoms up.
First you have to slide the a value to the end and mutiply with the c value so it is easily factorable
x^2+12x+35
Then you solve it like always
(x+7)(x+5)
Now, don't forget our buddy 7
7 is coming back
we divide 7 by 7 and 5 by 7
so
(x+1)(x+5/7)
7 has to move
So we move the 7 to the front
Therefore the answer is
(x+1)(7x+5)
If you have questions please ask me
Answer:
(7x + 5) (x + 1)
Step-by-step explanation:
7x² + 12x + 5
general form ax² + bx + c
a = 7
b = 12
c = 5
we have to find number that, if
... × ... = a . c = 7 . 5 = 35
... + ... = b = 12
and it would be
7 × 5 = a . c = 7 . 5 = 35
7 + 5 = b = 12
7x² + 7x + 5x + 5
= 7x (x + 1) + 5 (x + 1)
= (7x + 5) (x + 1)
#CMIIWOscar buys his lunch in the school cafeteria the cost of 15 school lunches is 33.75 which graph has a slope that best represents the average cost of the lunches in dollar per lunch ?
Answer:
The graph should be increasing 2.25 each time
Step-by-step explanation:
Since Oscar buys his lunch in school cafeteria and the cost of 15 school lunches is 33.75
Divide them: 33.75 ÷ 15 =
and will represents the average cost of the lunches in dollar per lunch that is 2.25
suppose the function f(t) = e^t describes the growth of a colony of bacteria, where t is hours. find the number of bacteria present at 5 hours
a) 59.598
b) 148.413
c) 8.155
d) 79. 432
The number of bacteria present at 5 hours is 148.413. The Option B is correct.
What is the number of bacteria present at 5 hours?In exponential growth, a population's growth rate stays the same regardless of population size which makes the population grow faster and faster as it gets larger.
To get number of bacteria present at 5 hours, we need to evaluate the function [tex]f(5) = e^5.[/tex]
Using a calculator, we get:
[tex]f(5) = e^5\\f(5) = 148.413159103\\f(5) = 148.413.[/tex]
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A bag contains pennies, nickels, dimes, and quarters. There are 50 coins in all. Of the coins, 12% are pennies and 34% are dimes. There are 3 more nickels than pennies. How much money does the bag contain?
Answer:
i think the bag contains $3.56
Step-by-step explanation:
what is 5w–4w–w+6w simplified
The value of the expression 5w–4w–w+6w is 6w
What is simplification of expression?When you simplify an expression, you're basically trying to write it in the simplest way possible. At the end, there shouldn't be any more adding, subtracting, multiplying, or dividing left to do.
For example, 2( 3a+5) can be simplified by using 2 to multiply both 3a and 5. This will give 6a+10. This means that the simplification of 2(3a+5) = 6a+10.
Similar , 5w-4w-w+6w can be simplified into:
5w+6w-4w-w
= 11w-5w
= 6w.
Therefore,the value of the expression 5w–4w–w+6w is 6w
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Look at the box plot shown below. What is the minimum value of the data set?
A box plot labeled Volunteer Service Hours with the beginning of quartile 1 at 13, the beginning of quartile 2 at 16.5, the beginning of quartile 3 at 20, the beginning of quartile 4 at 23, and the end of quartile 4 at 27.
The minimum value of the data set is 10.5.
Box plots are an effective graphical tool used to display a summary of a dataset. They provide a visual representation of the minimum and maximum values, quartiles, and outliers of the data. They are commonly used in statistics and can provide valuable insights into a dataset.
Now, let's consider the box plot in question. The box plot is labeled "Volunteer Service Hours" and it has four quartiles, each marked by a horizontal line. The first quartile (Q1) is marked at 13, the second quartile (Q2) is marked at 16.5, the third quartile (Q3) is marked at 20, and the fourth quartile (Q4) is marked at 23, with the end of the box extending to 27.
The minimum value of the data set can be found at the lower whisker of the box plot.
The lower whisker represents the minimum value that is not an outlier.
In this box plot, we do not see any outliers, so the minimum value of the dataset is represented by the lower end of the whisker, which is located at 10.5.
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pleaseeee help me!!
mathematics the pic below
Answer:
15, 18, 21, 24, 27, 30 ( +3)
7, 14, 28, 56, 112, 224, 448 ( x 2)
77, 70, 63, 56, 49, 42, 35 ( - 7)
20, 31, 42, 53, 64, 75, 86, 97 (+11)
22, 35, 48, 61, 74, 87 (+13)
Imagine Math simple interest
The simple interest which has the least amount of interest is investment of $ 2000 at 10 % for 3 years
Given data ,
SI is the simple interest, P is the principal amount, r is the annual interest rate, and t is the time in years.
Given that P = 2000, r = 10% = 0.1, and t = 3 years, we can calculate the simple interest as:
SI = 2000 x 0.1 x 3 = 600
Hence , the simple interest earned on an investment of $2000 for 10% at SI for 3 years is $600
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NO LINKS!! URGENT HELP PLEASE!!
This prism has a right angle for a base.
What is the volume of the prism?
Explain your thinking
Answer:
48 unit cube
Step-by-step explanation:
Solution Given:
For Triangle ABC
hypotenuse AB= 5
base AC=4
By using hypotenuse law
height BC=[tex]\sqrt{5^2-4^2} =3[/tex]
Now Area of the right-angled triangle is 1/2 * base*height
=1/2*AC*BC=1/2*4*3=6 units square
As we know that
The volume of triangular prism: Area of base * height
over here Area of the base= Area of the Triangle and the height is the length of the prism
=6 units square*CF
=6 units square*8
=48 unit cube
Answer:
The volume of the given prism is 48 cubic units.
Step-by-step explanation:
The volume of a prism can be calculated by multiplying the area of its base by its height.
The bases of the given prism are the congruent right triangles ABC and DEF.
We have been given the measures of sides AB and AC of triangle ABC.
To determine the area of ΔABC, we first need to calculate the measure of side BC using Pythagoras Theorem:
[tex]\implies AC^2+BC^2=AB^2[/tex]
[tex]\implies 4^2+BC^2=5^2[/tex]
[tex]\implies 16+BC^2=25[/tex]
[tex]\implies BC^2=9[/tex]
[tex]\implies BC=3[/tex]
The area of a triangle is half the product of its base and height.
The base and height of a right triangle are its legs.
[tex]\begin{aligned}\textsf{Area of base}&=\textsf{Area of $\triangle ABC$}\\\\&=\dfrac{1}{2} \cdot BC \cdot AC\\\\&=\dfrac{1}{2} \cdot 3 \cdot 4\\\\&=6\; \sf square\;units\end{aligned}[/tex]
Therefore, the area of the base of the prism is 6 square units.
Finally, to find the volume of the prism, multiply the area of the base by the height of the prism:
[tex]\begin{aligned}\textsf{Volume of prism}&=\textsf{Area of base} \cdot \sf height\\\\&=\textsf{Area of $\triangle ABC$} \cdot \overline{CF}\\\\&=6 \cdot 8\\\\&=48\; \sf cubic\;units\end{aligned}[/tex]
Therefore, the volume of the given prism is 48 cubic units.
College Level Trig Question
Note tha given the above trigonometric expression, the solution is
x = 2π/3 or 4π/3
How did we arrive at that ?We will start by simplifing the equation by moving all the terms involving sin (x/2) to one side..
2sin (x /2) = √(3)
Then, we can solve for sin(x/2) by dividing both sides by two
sin (x /2) = √(3)/2
This is true when x/2 is π /3 or 2π/3, since these are the values where
sin ( π/3) = √(3)/2 and
sin (2π/3) = √(3)/2.
To find the values of x, we multiply these solutions by two
x = 2pi/3 or 4pi/3
Since we need to make sure that these solutions are in the given interval (0, 2π)
both solutions are in the interval, so our final answer is
x = 2π/3 or 4 π/3
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The graph of an equation is sketched in the figure.
Describe five ordered-pair solutions of this equation by
using a table.
X
-6
-3
0
3
6
y
☐
I
8-
10-88427
6
40
10
The value of five ordered-pair solutions of this equation by using a table are,
x y
- 6 - 1
- 3 - 2
0 3
3 - 4
6 - 5
We have to given that;
The graph of an equation is sketched in the figure.
Hence, From graph we get;
The value of five ordered-pair solutions of this equation by using a table are,
x y
- 6 - 1
- 3 - 2
0 3
3 - 4
6 - 5
Thus, The value of five ordered-pair solutions of this equation by using a table are,
x y
- 6 - 1
- 3 - 2
0 3
3 - 4
6 - 5
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The current of a river is 2 miles per hour. A boat travels to a point 15 miles upstream and back in 4
hours. What is the speed of the boat in still water?
Using the relationship of distance, time and speed, the speed of the boat in still water is 8mi/hr
What is the speed of the boat in still water?To determine the speed of the boat in still water, we can write an equation to represent this.
The speed as it travels upstream = x - 2
The speed as it travels downstream = x + 2
The total distance travelled by the boat = 15 + 15 = 30mi
Let's write an equation to represent this;
15/(x - 2) + 15/(x + 2) = 4
simplifying this;
15(x + 2) + 15(x - 2) = 4(x - 2)(x + 2)
15x + 30 + 15x - 30 = 4x² - 16
30x = 4x² - 16
4x² - 30x - 16 = 0
Solving for x;
x = -0.5, 8
But since the speed can't be negative, the speed is 8 mi/hr
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Express 1:0.2:0.75 in their simple form
The given ratio 1:0.2:0.75 can be expressed in its simplest form as 5:1:3/4.
To express 1:0.2:0.75 in its simplest form, we need to find the common factor that can divide all the numbers in the ratio without leaving a remainder.
First, we can convert 0.2 to a fraction by dividing 2 by 10, which gives us 1/5. Thus, the ratio can be rewritten as
1:0.2:0.75
= 1:2/10:0.75
= 1:1/5:0.75.
To find the common factor, we can convert all the numbers to fractions with a denominator of 5. We do this by multiplying the first number by 5/5, the second number by 1/1, and the third number by 5/4.
This gives us,
5/5:1/5:15/20.
Next, we can simplify the ratio by dividing all the numbers by their greatest common factor (GCF). In this case, the GCF is 1/5.
Dividing all the numbers in the ratio by 1/5 gives us,
5:1:15/4.
Finally, we can simplify 15/4 by dividing both the numerator and denominator by 5. This gives us 3/4. Thus, the final simplified ratio is 5:1:3/4.
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Stephanie bought two rugs. One rug is 15 feet long, and the other rug is 142 feet long. Each rug has a width of 10 feet.
What is the total area in square feet of the two rugs?
A 175 ft²
B 155 ft²
C 147.5 ft²
D 302.5 ft²
*please help me
The total area of the two rugs in square feet is calculated as: 1570 ft² (none of the options are correct).
How to Find the Total Area of the Rug?To find the total area of the two rugs, we first need to calculate the area of each rug by multiplying its length and width.
Area of the first rug = 15 ft x 10 ft = 150 ft²
Area of the second rug = 142 ft x 10 ft = 1420 ft²
Now, we can find the total area by adding the area of both rugs:
Total area = 150 ft² + 1420 ft² = 1570 ft²
Therefore, the answer is not one of the options provided.
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ALPHABET Which of the following letters
contain at least one acute angle? Which
contain vertical angles? Which contain
adjacent angles?
A E L X
The letters "L" and "X" both contain adjacent angles, as adjacent angles are angles that share a common vertex and side. In both letters, there are two angles that share a vertex and a side.
What is Acute angle ?
An acute angle is an angle that measures between 0 and 90 degrees. In other words, an acute angle is an angle that is smaller than a right angle, which measures exactly 90 degrees.
The letter "A" contains an acute angle, as the angle between the two lines that form the letter is less than 90 degrees.
None of the letters A, E, L, or X contain vertical angles, as vertical angles are formed by two intersecting lines and none of these letters contain intersecting lines.
Therefore, The letters "L" and "X" both contain adjacent angles, as adjacent angles are angles that share a common vertex and side. In both letters, there are two angles that share a vertex and a side.
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Solve for x. Round to the nearest tenth, if necessary.
Answer:
9.6
Step-by-step explanation:
sin(angle)= opposite/hypotenuse
sin(42°)=6.4/X
X*SIN(42°)=6.4
X=6.4/SIN(42)
X=9.6
Answer:
Step-by-step explanation:
sin(42°)=6.4/X
X*SIN(42°)=6.4
X=6.4/SIN(42)
sin(42°)=6.4/X
X*SIN(42°)=6.4
X=6.4/SIN(42)
X=9.6
In problem # 14 solve for y.
The required value of y is 14 units for the given right triangle.
14. It is required to find the value of y.
According to the attached figure, we have a right triangle that has:
Length of AB = x units
Length of BC = 7 units
Length of AC = y units
∠ABC = 90°
∠BAC = 30°
As per the sine ratio, it can be written as follows:
sin 30° = BC/ AC
1/2 = 7/y
Apply the cross-multiplication, and we get
y = (7)(2)
y = 14 units
Therefore, the required value of y is 14 units for the given right triangle.
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Please find the equation of the circle! (Thx)
Answer:
[tex] {(x - 1)}^{2} + {(y - 2)}^{2} = 5 [/tex]
HELP QUICK!
The owners of the pet sitting business have set aside $96 to purchase chewy toys for dogs, x, and collars for the cats, y. They are pricing the items at two different stores and wondering if there are any combinations of these items that could be purchased at both stores for the same price.
Marco’s Market: The price of a chewy toy for dogs is $2 while the price of a cat collar is $8.
Sonia’s Superstore: The price of a chewy toy for dogs is $4 and the price of a cat collar is $4.
Create an equation to represent the quantities of each item that can be purchased at each store. Then, graph the equations on the coordinate axes with proper labels and scale. Use the graph to find the combination of chewy toys for dogs and cat collars for cats that adds up to the same amount and price at both stores.
Answer:Let's assume that the number of chewy toys for dogs purchased at Marco's Market is represented by x, and the number of cat collars purchased at Marco's Market is represented by y. Similarly, let's assume that the number of chewy toys for dogs purchased at Sonia's Superstore is represented by a, and the number of cat collars purchased at Sonia's Superstore is represented by b.
The total cost of chewy toys for dogs and cat collars at Marco's Market is given by:
2x + 8y
The total cost of chewy toys for dogs and cat collars at Sonia's Superstore is given by:
4a + 4b
We want to find values of x, y, a, and b such that:
2x + 8y = 4a + 4b
Simplifying the equation, we get:
x + 4y = 2a + b
We also know that the total amount set aside for the purchases is $96. Therefore, we have:
2x + 8y + 4a + 4b = 96
Simplifying the equation, we get:
x + 4y + 2a + b = 48
Now, we can plot the graph of the equation:
x + 4y = 2a + b
To plot the graph, we can rearrange the equation as follows:
4y - b = 2a - x
y = (2a - x + b)/4
We can choose values of x and b, and then calculate the corresponding values of y and a using the equation. For example, let's choose x = 0 and b = 8. Then, we have:
y = (2a - 0 + 8)/4 = (2a + 8)/4 = 0.5a + 2
Similarly, we can choose other values of x and b, and calculate the corresponding values of y and a. We can then plot the points on the graph and join them to get the line representing the equation.
Here is the graph:
Graph
To find the combination of chewy toys for dogs and cat collars for cats that adds up to the same amount and price at both stores, we need to find the point where the line intersects the line representing the equation of the total cost:
x + 4y + 2a + b = 48
We can find this point by solving the two equations simultaneously. However, we can also use the graph to estimate the point. From the graph, we can see that the point of intersection is approximately (12, 6). This means that we can purchase 12 chewy toys for dogs and 6 cat collars at Marco's Market, and 4 chewy toys for dogs and 10 cat collars at Sonia's Superstore, and the total cost would be $48 at both stores.
Step-by-step explanation:
what are the answers to these questions?
The length of wire used for the square is 0.25 meters and the length of wire used for the circle is 1 meter. To maximize the total area, the wire should be cut in half, with each piece having a length of 1 meter.
To minimize the total area of both figures and minimize the length of wire used, the wire should be cut in half, giving each piece a length of 1 meter.
For the square frame, we know that each side of the square is equal to the length of wire used to make it, so we can divide the 1 meter of wire in half to get 0.5 meters for each side of the square.
The perimeter of the circle is the length of wire used to make it, so we can use the remaining 1 meter of wire to find the radius of the circle:
2πr = 1
r = 1/(2π)
Using this radius, we can find the circumference of the circle and the length of wire used:
C = 2πr = 1 meter
Therefore, the length of wire used for the square is 0.5 meters and the length of wire used for the circle is 1 meter.
To maximize the total area, we need to cut the wire into two equal pieces, each with a length of 1 meter.
For the square frame, each side will have a length of 0.25 meters, which will give us a total area of 0.0625 square meters.
For the circle, the radius will be 1/(4π) meters, which will give us a circumference of 1/(2π) meters and a total area of π/(16) square meters.
Therefore, to maximize the total area, the wire should be cut in half, with each piece having a length of 1 meter.
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The questions I need answered are in the picture… help plsss
The graph of the linear equation y = (1/2)*x + 3 can be seen in the image at the end.
How to graph the linear equation?Here we want to graph the linear equation:
y = (1/2)*x + 3
To graph it we need to find a few points on the line, graph them on a coordinate axis and then draw a line that connects them.
The first point that we can use is the y-intercept, it is what we get when we evaluate in x = 0.
y = (1/2)*0 + 3
The point is (0, 3)
Then we can get other points by evaluating in different values of x, for example, if x = 2
y = (1/2)*2 + 3 = 1+ 3 =4
If x = 4
y = (1/2)*4 + 3 = 2 + 3 = 5
So we have the points (2, 4) and (4, 5)
Now just graph all these points on a cordinate axis and connect them with a line, you will get a graph like the one in the image below.
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Please help me with this
Answer: 1st option
explanation: The ones that are crossed out include 1 whole number and 7 1/8 pieces. this is equal to 1 and 7/8. Then there is 3 whole 1 pieces so the answer is the 1st option
what does scaled version mean in this case its 3:5 scaled version but i just want to know what it means asap please help
Scaled version means adjusted value from the original size. For example, 3:5 could be a scaled version of 6:10.
Understanding Scale VersionScale Version of an object is a replica or model of the original object that has been proportionally reduced or enlarged in size. The scale of a model is the ratio of the size of the model to the size of the original object. For example, if a model of a building is one-tenth the size of the actual building, then the scale of the model is 1:10, which means that every measurement on the model is one-tenth of the corresponding measurement on the actual building.
Scale versions of objects are often used in engineering, architecture, and design to create smaller or larger versions of objects that can be studied, tested, or used for other purposes. For example, architects might create scale models of buildings to study their design and appearance, while engineers might create scale models of machines or structures to test their performance under different conditions.
Scale versions can also be used in maps, where the scale is used to indicate the relationship between the size of the map and the size of the area it represents. In this case, the scale might be represented as a ratio, such as 1:10,000, or as a statement of the size of a unit of measurement on the map, such as 1 inch equals 1 mile.
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50 Points! Multiple choice algebra question. Photo attached. Thank you!
Answer: C {m | m > 2}
Step-by-step explanation:
write the number in exponential form with the base of 2
2^3m-4 > 2^2
compare the exponents = 3m-4 >2
move the constant to the right and then change the sign
3m> 2+4 add
3m>6 divide
m>2