The amount of energy absorbed by the pennies made up of copper is 146.25J
What is an equation?An equation is an expression that shows the relationship between two or more variables and numbers.
Amount of energy absorbed = mass * temperature change * specific heat capacity
Amount of energy absorbed = 25 * (38 - 23) * 0.39 = 146.25J
The amount of energy absorbed by the pennies made up of copper is 146.25J
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find the measure of the indicated angle to the neareat degree. show your equation, use proper trig function, and clearly mark your answer.
Step-by-step explanation:
for 1st triangle on the left
sin(x) = 24/38
x = inverse sin(24/38)
x = 39.1667 deg
for triangle 2
cos(x) = 20/52
x = inverse cos (20/52)
x = 67.38 deg
A Pew Research study finds that 23% of Americans use only a cell phone, and no land line, for making phone calls (The Wall Street Journal, October 14, 2010). A year later, a researcher samples 200 Americans and finds that 51 of them use only cell phones for making phone calls. Test whether the proportion of Americans who solely use cell phones to make phone calls differs from 23%. Use the .05 level of significance.
Using the z-distribution, it is found that since the p-value is greater than 0.05, the proportion does not differ from 23%.
What are the hypotheses tested?At the null hypotheses, it is tested if the proportion is of 23%, that is:
[tex]H_0: p = 0.23[/tex]
At the alternative hypotheses, it is tested if the proportion differs from 23%, hence:
[tex]H_1: p \neq 0.23[/tex]
What is the test statistic?The test statistic is given by:
[tex]z = \frac{\overline{p} - p}{\sqrt{\frac{p(1-p)}{n}}}[/tex]
In which:
[tex]\overline{p}[/tex] is the sample proportion.p is the proportion tested at the null hypothesis.n is the sample size.The parameters are given as follows:
[tex]p = 0.23, n = 200, \overline{p} = \frac{51}{200} = 0.255[/tex]
The value of the test statistic is:
[tex]z = \frac{\overline{p} - p}{\sqrt{\frac{p(1-p)}{n}}}[/tex]
[tex]z = \frac{0.255 - 0.23}{\sqrt{\frac{0.23(0.77)}{200}}}[/tex]
z = 0.84.
Using a calculator and considering a two-tailed test, as we are testing if the proportion is different of a value, with z = 0.84, the p-value is of 0.4.
Since the p-value is greater than 0.05, the proportion does not differ from 23%.
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Sketch the graph of the relation function
[tex] h(x) = \frac{ {x}^{2} + 6x + 8}{ {x}^{2} + 8x + 15} [/tex]
by listing all the intercepts, asymptotes,and the behaviour of the graph with respect to the asymptotes.
Step-by-step explanation:
1) X-intercept: -2; -4;
Y-intercept: 0.533;
2) asymptotes: x= -3 and x= -5;
3) if x→ -5(-0), then y→+∞;
if x→ -5(+0), then y→-∞;
if x→ -3(-0), then y→-∞;
if x→ -3(+0), then y→+∞;
Question 7(Multiple Choice Worth 1 points)
(02.05 MC)
Write the equation of a function whose parent function, f(x) = x + 6, is shifted 4 units to the right.
Og(x)=x-10
Og(x)=x-4
Og(x)=x+2
g(x) = x + 10
Question 8(Multiple Choice Worth 1 points)
100.05
7
2
Answer:
g(x) = x + 2 ⇒ 3rd answer
Three times a number, x, increased by four is equal to five times the number, x. Which equation can be used to sol
for x?
3x+5x-4
3x+4-5x
3x-4+5x
O3x-4-5x
Answer: 3x+4-5x
Step-by-step explanation:
3x+4=5x
3x+4-5x=0
just do it for the point's my next one will have 69 points
thanks
:) 888888888888888888888888888888888888888888888888888
The graph of the function f(x) = (x-4)(x + 1) is shown
below.
4-2
64
Mark this and return
6
2
T
6
2
6
X
Which statement about the function is true?
The function is increasing for all real values of x
where
x<0.
O The function is increasing for all real values of x
where
x < -1 and where x > 4.
O The function is decreasing for all real values of x
where
-1 < x < 4.
O The function is decreasing for all real values of x
where
x < 1.5.
Answer: The function is decreasing for all real values of x where x < 1.5.
Step-by-step explanation:
The axis of symmetry is [tex]x=\frac{4-1}{2}=1.5[/tex]
Since the coefficient of [tex]x^2[/tex] is positive, the graph opens upwards.
So, the function is decreasing for all real values of x where x < 1.5.
(Help asap!!!, will give brainlyest to first answer)
Rearrange the equation below to solve for x.
3kx+2kx=10
Answer:
B
Step-by-step explanation:
3kx + 2kx = 10 ← collect like terms on left side
5kx = 10 ( isolate x by dividing both sides by 5k )
[tex]\frac{5kx}{5k}[/tex] = [tex]\frac{10}{5k}[/tex]
x = [tex]\frac{2}{k}[/tex]
Which rule describes the composition of transformations that maps ΔDEF to ΔD''E''F''?
R0,90° ∘ T5,0(x, y)
T–5,0 ∘ R0,90°(x, y)
T5,0 ∘ R0,90°(x, y)
R0,90°(x, y) ∘ T–5,0
The transformations rule for changing DEF into D"E"F is
(b) T-5,0-RO. 90° (x,y)
Which rule describes the composition of transformations that maps ΔDEF to ΔD''E''F''?To transform a shape is to alter its dimensions and relative placement.
To convert from DEF to D"E"F, use this rule:
(b) T-5,00 RO, 90°(x, y)
From the complete question,
When DEF is spun 90 degrees counterclockwise, it becomes GH.
Then, 5 units were subtracted from the right and translated to the left.
Assume a rotation of 90 degrees counterclockwise, and write it as:
RO, 90°(x,y)
As a symbol, the leftward translation of 5 units looks like this:
T-5,0(x,y)
When both transformations are combined, we have:
T-5,0 R0.90° (x. y)
In conclusion, the transformations rule for changing DEF into D"E"F is
(b) T-5,0-RO. 90° (x,y)
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Write 7/24 as an equivalent fraction with a denominator of 96
Answer: [tex]\frac{28}{96}[/tex]
Step-by-step explanation:
We will figure out what needs to happen to the denominator to get to 96, then we will do the same to the numerator.
[tex]\displaystyle \frac{7}{24}=\frac{?*x}{24*x=96} =\frac{7*4}{24*4}=\frac{28}{96}\\\\ \\\text \\\;\;\;\;\;\; \frac{28}{96}[/tex]
Answer:
28/96
Step-by-step explanation:
Equalize the equivalent fractions according to the desired denominator and solve for the numerator "x"
[tex]\frac{7}{24} =\frac{x}{96}[/tex]
[tex]x=\frac{(96)(7)}{24} =\frac{672}{24} =28[/tex]
The equivalent fraction is
[tex]\frac{28}{96}[/tex]
Hope this helps
Pls help! Geometry
What is the perimeter and area of the shape above?
Perimeter of the shape = 27.15 units.
Area = 32.3 units²
How to Find the Perimeter and Area of a Composite Shape?The Perimeter of the shape = 1/2(perimeter of circle) + hypotenuse and height of the triangle
Perimeter = = 1/2(2π(5/2)) + [√(9² + 5²)] + 9 = 7.85 + 10.3 + 9 = 27.15 units.
Area = 1/2(area of circle) + area of triangle = 1/2(πr²) + 1/2(bh)
Area = 1/2(π2.5²) + 1/2(5)(9)
Area = 9.8 + 22.5
Area = 32.3 units²
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5% dextrose infused over 8 hours. how many ml of iv fluid is infused after 6 hours?
The nurse prepares a 1,000 ml IV of 5% dextrose and water to be infused over 8 hours.
We have given that,
5% dextrose infused over 8 hours.
We have to determine the ml of iv fluid is infused after 6 hours.
What is the mixture problem?
A value mixture problem involves combining two ingredients that have different prices into a single blend.
The infusion set delivers 10 drops per milliliter.
The nurse should regulate the IV to administer approximately 21 drops per minute.
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The number of hours per week that the television is turned on is determined for each family in a sample. The mean of the data is 36 hours and the median is 32.2 hours. Twenty-four of the families in the sample turned on the television for 21 hours or less for the week. The 11th percentile of the data is 21 hours.
Step 1 of 5 : Based on the given information, determine if the following statement is true or false.
The 54th percentile is greater than or equal to 31 hours.
true or false
Using the median concept, it is found that the statement is true.
What is the median of a data-set?The median of the data-set separates the bottom half from the upper half, that is, it is the 50th percentile.
In this problem, we have that the 50th percentile is of 33.2 hours, hence the 54th percentile has to be above 33.2 hours = above 31 hours, hence the statement is true.
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Question 3
B
16 cm
38°
-C
Calculate the length of AB to 2 decimal places.
The question was incomplete. Below you can find the missing content.
ABC is a right-angled triangle.
b=16 cm
∠C=38°
Calculate the length of AB. Give your answer correct to 2 decimal places.
The picture is also attached below.
The length of the side AB is 9.85 cm.
From the triangle, it is given that
b= AC=16 cm
∠C=38°
Given that ΔABC is a right-angled triangle.
where ∠B=90°
So, here we can apply the SOH CAH TOA identity
As we know the value of sinθ is the ratio of the opposite side and the hypotenuse of the angle θ.
So, sinθ = opposite side/ hypotenuse
In triangle ΔABC
⇒ sin 38°= AB/AC
⇒ sin 38°= AB/16
⇒ AB= 16 sin 38°
⇒ AB= 9.85 cm
Therefore the length of the side AB is 9.85 cm.
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You roll a fair six-sided die twice. Find the probability of rolling a 2 the first time and a number greater than 4 the second time.
Answer:
1/18
Step-by-step explanation:
So to find the probability of two independent events, you simply multiply the two probabilities. So the probability of rolling any individual number is 1/6 because there's 6 possibilities, and there are no duplicate numbers. So the probability of rolling a 2 the first time is 1/6. The probability of rolling a number greater than 4 has a probability of 2/6, since the numbers 5 and 6 are both greater than 4. This can be further simplified to 1/3. Multiplying these two probabilities gives you 1/18
Perimeter and area
What is the area of the square, circle, and shaded region?
A)
B)
C)
(a) The side length of the square is 8 m, so its area is 64 square m.
(b) The radius of the circle is 4 m, so its area is [tex](\pi)(4^{2})=16\pi[/tex] square m.
(c) Subtracting areas, we get the area of the shaded region is [tex]64-16\pi[/tex] square m.
Please see attached photo please
[tex]\huge\text{Hey there!}[/tex]
[tex]\huge\textbf{Equation:}[/tex]
[tex]\mathsf{-b + 8c}[/tex]
[tex]\huge\textbf{Simplifying: }[/tex]
[tex]\mathsf{-b + 8c}[/tex]
[tex]\mathsf{= -2 + 8(-2)}[/tex]
[tex]\mathsf{= -2 - 16}[/tex]
[tex]\mathsf{= -18}[/tex]
[tex]\huge\textbf{Therefore, the answer should be: }[/tex]
[tex]\huge\boxed{\frak{-18}}\huge\checkmark[/tex]
[tex]\huge\text{Good luck on your assignment \& enjoy your day!}[/tex]
~[tex]\frak{Amphitrite1040:)}[/tex]
In how many ways can a 7 person committee be chosen from a group of 10 people?
[tex]\displaystyle\\\binom{10}{7}=\dfrac{10!}{7!3!}=\dfrac{8\cdot9\cdot10}{2\cdot3}=4\cdot3\cdot10=120[/tex]
Write each phrase as a mathematical expression.
The quotient of 8 more than the radius, r, and 4
Answer: (r+8)/4
Step-by-step explanation:
Not much really to explain...
What is the greatest common factor of 44, 40, and 50?
Answer:
2
Step-by-step explanation:
44 = 2² × 11
40 = 2³ × 5
50 = 2 × 5²
GCF = product of common factors with lower exponent
GCF = 2
The greatest common factor of 44, 40, and 50 will be;
⇒ 2
What is Greatest common factors?
The highest number that divides exactly into two more numbers, is called Greatest common factors.
Given that;
The numbers are,
⇒ 44, 40 and 50.
Now,
The factors are find as;
⇒ 44 = 2 × 2 × 11
⇒ 40 = 2 × 2 × 2 × 5
⇒ 50 = 2 × 5 × 5
Hence, The greatest common factor of 44, 40, and 50 will be;
⇒ 2
Thus, The greatest common factor of 44, 40, and 50 will be;
⇒ 2
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write the slope intercept form of the equation or each line
The slope intercept equation is 3y+ 2x = -4.5,
What is slope intercept equation?The equation of a straight line in the form y = mx + b where m is the slope of the line and b is its y-intercept.
let the two points from the graph is (4, -4) and (-2, 0)
then
m= 4/ -6= -2/3
and the intercept is 1.6 as the line intersects the y- axis.
So, the slope intercept is
y= -2/3x - 1.6
3y= -2x - 4.5
3y+ 2x = -4.5
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Complete the following questions. 2 x 4² x 2 = (6 x 3²) ÷ 9 =
Answer:
4 ^x27
3
Step-by-step explanation:
2x4^2x2(6x3^2)
9
Simplifies to:
4 ^x27
3
=
4 ^x27
3
10) Bill found a pair of running shoes for $57. The regular price was $68.99. He also found a sweat suit that was
originally $37.80. It was marked down 25%. Find his total SAVINGS.
Oa.) $20.46
Ob.) $21.84
Oc.) $20.45
Od.) $21.44
Answer:
$21.44 or answer D
Step-by-step explanation:
68.99-57=11.99
37.80 x 25/100=9.45
9.45+11.99=21.44
hope this helps you
IM IN A HURRY PLEASE HELP ME QUESTION IS DOWN BELOW WORTH 15 POINTS each
Answer:
.
Step-by-step explanation:
A small startup company wishes to know how many hours, per week, that it's employees spend commuting to and from work. The number of hours for each employee are shown below. Construct a frequency table for grouped data using four classes.
1,2,18,4,13,18,12,3,17,10,3,12,15,2 15,8,5,17,18,18
The frequency table for grouped data using four classes is shown in the picture.
What are statistics?Statistics is a mathematical tool defined as the study of collecting data, analysis, understanding, representation, and organization. Statistics is described as the procedure of collecting data, classifying it, displaying that in a way that makes it easy to understand, and analyzing it even further.
We have:
A small startup company wishes to know how many hours, per week.
The number of hours for each employee are shown below:
1,2,18,4,13,18,12,3,17,10,3,12,15,2 15,8,5,17,18,18
Make the group of 1-5, 6-10, 11-15, and 16-20
And count the numbers lies between the interval.
Thus, the frequency table for grouped data using four classes is shown in the picture.
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find x and y.
pls pls help
Answer:
x = 65 , y = 64
Step-by-step explanation:
y - 16 and 2y + 4 are same- side interior angles and sum to 180° , that is
y - 16 + 2y + 4 = 180
3y - 12 = 180 ( add 12 to both sides )
3y = 192 ( divide both sides by 3 )
y = 64
then
2y + 4 = 2(64) + 4 = 128 + 4 = 132
the exterior angle of a triangle is equal to the sum of the 2 opposite interior angles.
2y + 4 is an exterior angle of the triangle , then
x + 67 = 132 ( subtract 67 from both sides )
x = 65
Part III: Find the unknown side lengths, AB and BC. HINT: Use either the Pythagorean Theorem or special right triangle properties.
The measurement of sides AB, BC, and AC will be 3 units,3 units, and 3√2 units respectively.
What is a right-angle triangle?If any of its inner angles is 90 degrees, the triangle is said to be right-angled. Another term for this triangle is the right triangle or 90-degree triangle.
From the given triangle, it is observed that one of the angles is 90°, showing the given triangle is a right-angle triangle.
From the Δ ABC we found;
tan 45° = AB/BC
1=AB/BC
AB=BC
sin 45° = AB/AC
(1/√2)=AB/AC
AC = √2 AB
From the graph, it is observed that
AB=BC =3 units
AC= √2 AB
AC = 3√2 units
Hence, the measurement of sides AB, BC, and AC will be 3 units,3 units, and 3√2 units respectively.
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5. The graph of F(x), shown below, resembles the graph of G(x)=x2, but it has been
flipped over the x-axis, stretched vertically by a factor of 3, shifted down 4 units, and
left 1 unit.
-6
F(X)
Part I: Write the equation of F(x).
Using translation concepts, the equation of F(x) is given as follows:
-3(x + 1)² - 4.
What is a translation?A translation is represented by a change in the function graph, according to operations such as multiplication or sum/subtraction in it's definition.
The effect of the transformations on G(x) = x² is given as follows:
Reflection over the x-axis: F(x) = -G(x) = -x².Vertical stretch by a factor of 3: F(x) = -3G(x) = -3x².Shift down of 4 units: F(x) = -3G(x) - 4 = -3x² - 4.Shift left of 1 units: F(x) = -3G(x + 1) - 4 = -3(x + 1)² - 4.More can be learned about translation concepts at https://brainly.com/question/4521517
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Which expression represents a rational number?
StartFraction 5 Over 9 EndFraction + StartRoot 18 EndRoot
Pi + StartRoot 16 EndRoot
StartFraction 2 Over 7 EndFraction + StartRoot 121 EndRoot
StartFraction 3 Over 10 EndFraction + StartRoot 11 EndRoot
The rational number among all the answer choices is; Pi + √16.
What is a Rational number?A rational number by definition, is one that can be represented as the quotient a/b of two integers in which case b ≠ 0.
On this note, it follows that since the constant pi is; 22/7, the number pi + √16 can be represented as a rational number as follows;
22/7 + 4 = 50/7.
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Answer:
The answer is b.
Step-by-step explanation:
goodluck
find x and y !!!!
pls pls help
Answer:
x = 59°, y = 31°
Explanation:
Angles (x) and (x - 28) sum ups to 90° on a straight line.
→ x + (x - 28) = 90
→ 2x - 28 = 90
→ 2x = 90 + 28
→ 2x = 118
→ x = 59°
Then find value of y
Angle y, x, 90° lies on a straight line which sum ups to 180°
→ x + y + 90° = 180°
→ 59 + y + 90° = 180°
→ y = 180° - 149°
→ y = 31°