10. Find the value of a²-b if a = 3 and b = -5.
Answers
Related Questions
The table below shows the probability distribution of a random variable Z. Z P(Z) -13 0.69-12 0.18 -11 0.04 -10 0.01 -9 0.01 -8 0.04 -7 0.03 What is the expected value of Z? Write your answer as a decimal.
Answers
To be able to get the expected value of Z, we will be using the following formula:
[tex]\text{ Expected Value = }\mu=Z_1P_1+Z_2P_2+Z_3P_3\text{ + }\ldots Z_nP_n[/tex]We get,
[tex]\text{ Expected Value = }\mu=Z_1P_1+Z_2P_2+Z_3P_3\text{ + }\ldots Z_nP_n[/tex][tex]\text{ = (-13)(0.69) + (-12)(0.18) + (-11)(0.04) + (-10)(0.01) + (-9)(0.01) + (-8)(0.04) + (-7)(0.03)}[/tex][tex]\text{ = (-8.97) + (-2.16) + (-0.44) + (-0.1) + (-0.09) + }(-0.32)\text{ + (-0.21)}[/tex][tex]\text{ = -8.97 - 2.16 - 0.44 - 0.1 - 0.09 }-0.32\text{ - 0.21}[/tex][tex]\text{ Expected Value = }\mu\text{ = -12.29}[/tex]Therefore, the expected value of Z is -12.29.
A contractor hired 150 workers to pave 30 miles of highway how many workers will they need to hire to pave 20 miles of highway in the same amount of time?
Answers
Answer: 100
Step-by-step explanation:
First, we need to know how many workers must be hired to pave one mile.
Which is 5 workers per 1 mile ( 150 / 30 )
Then you can either do
(5 + 5 +5 +5 + 5) + (5 + 5 +5 +5 + 5) + (5 + 5 +5 +5 + 5) + (5 + 5 +5 +5 + 5)
OR
5 x 20 = 100
( if I'm wrong it's like 3 am so I'm a bit slow but I hope I helped )
What is the largest five-digit multiple of 15 whose digits are all distinct and nonzero?
Answers
The largest five-digit multiple of 15 whose digits are all distinct and nonzero is 12345.
How can we express numbers belonging to decimal numeral system?Suppose that the number is abcd.efg and belongs to the decimal numerical system. Remember one thing that the place on the left of decimal point is called ones. Move one-one places to right, and divide by 10 and 10 more and more. Move one-one places to left, and multiply (un-divide) by 10 and 10 more and more. We will call d as ones digit, c as tens digit (it get multiplied by 10), b as hundreds digit etc.
WE need to find the five-digit multiple of 15 whose digits are all distinct and nonzero.
Thus, we can see that the largest five-digit multiple of 15 could be ;
12345
Since it must be all distinct and nonzero. so the correct digit is 12345.
Hence, the largest five-digit multiple of 15 whose digits are all distinct and nonzero is 12345.
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Which of the following is equivalent to −4(2x + 3y) − 6(3q + 7p)?
ill give coins or whatever its called...
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Answer: −8x − 12y − 18q − 42p
Step-by-step explanation:
i did the exam xD
helppppppppppppppppppppppppp me
Answers
Answer:
600
Step-by-step explanation:
[tex]R(1)=400 \\ \\ R(2)=1000 \\ \\ R(2)-R(1)=600[/tex]
Evalúe the limit. Show steps
Answers
After evaluating the limit we have came to find that the limit of [tex]\lim_{x\rightarrow -\infty }\frac{x^2}{x^2\ +4}[/tex] as x approaches ∞- is 1
What is limit?The value that a function, sequence, or index approaches as an input, or an index, approaches a particular value is known as a limit in mathematics. Limits, which are essential to calculus and mathematical analysis, are required by the definitions of continuity, derivatives, and integrals.
In addition to being closely related to the concepts of limit and direct limit in category theory, the idea of a limit of a sequence is further generalised to encompass the idea of a limit of a topological network.
A limit of a function is typically expressed in formulas as
[tex]{\displaystyle \lim _{x\to c}f(x)=L,}[/tex]
To find the limit we will use L'Hôpital's Rule
Find the derivative
⇒ [tex]\lim_{x\rightarrow -\infty }\frac{x^2}{x^2\ +4}[/tex]
⇒ [tex]\lim_{x\rightarrow -\infty }\frac{2x}{2x +0}[/tex]
⇒ [tex]\lim_{x\rightarrow -\infty }\frac{2x}{2x }[/tex]
Evalue -∞ as x
⇒ [tex]\frac{2(-\infty)}{2(-\infty)} }[/tex]
⇒ 1
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Statistics
Does the frequency distribution appear to have a normal distribution using a strict interpretation of the relevant criteria?
Speed-- Number of cars
0-29 4
30-59 16
60-89 60
90-119 20
No, the distribution is not symmetric THIS ONE
No, the frequency do not increase from the low frequency to a maximum frequency
Yes, all the requirements are met
Answers
Answer:
The answer to your question is: B
Explanation:
based on the statistics given, this answer best fits the Queston.
By air, the distance from city A to city B is 3001 miles less than the distance from city C to city D. If the total of these
← two distances is 7869 miles, find the distance from city C to city D.
miles
D
***
Answers
The distance from city C to city D is 5435 miles
What is basic algebra ?The area of mathematics known as algebra aids in the representation of issues or circumstances into mathematical statements. To create a meaningful mathematical expression, it requires variables like x, y, and z as well as mathematical operations like addition, subtraction, multiplication, and division. Algebra is used in all areas of mathematics, including coordinate geometry, calculus, and trigonometry. 2x + 4 = 8 is a basic algebraic expression.When operations like addition, subtraction, multiplication, division, etc. are performed on variables and constants, we obtain algebraic expressions as the mathematical statement.
The distance from city A to city B is 3001 miles Let distance from city A to city B x and distance from city C to city D y
The distance from city A to city B is 3001 miles
x= y - 3001....(i)
x+ y = 7869....(ii)
y- 3001 +y = 7869
2y = 10870
y=5435
The distance from city C to city D is 5435
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2 to 4 and 11 to 11/2 are they proportional
Answers
Explanation:
In this case we must compare 2 to 4 and 11 to 11/2
1. The first ratio given is 2 to 4
[tex]r_1=\frac{2}{4}=\frac{1}{2}[/tex]So, the first ratio is 1/2
2. The second ratio given is 11 to 11/2
[tex]\begin{gathered} r_2=\frac{11}{\frac{11}{2}}=\frac{2\cdot11}{11} \\ r_2=2 \end{gathered}[/tex]Finally, since r1 ≠ r2 they are not proportional
ANSWER:
they are not proportional
A 4-pint carton of yogurt costs $5.16.
What’s the price per quart
Answers
Using mathematical operations we can conclude that the cost per quart of yogurt is $1.29.
What are mathematical operations?An operation is a function in mathematics that transforms zero or more input values into a clearly defined output value. The operation's arity is determined by the number of operands. The rules that specify the order in which we should solve an expression involving multiple operations are known as the order of operations. PEMDAS stands for Parentheses, Exponents, Multiplication, Division, and Addition Subtraction (from left to right).So, the cost per quart:
The 4-pint carton of yogurt costs $5.16.Meaning that in the carton there are 4 quarts of yogurt.Cost per quart:
= 5.16/4= $1.29Therefore, using mathematical operations we can conclude that the cost per quart of yogurt is $1.29.
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Please help, you also need to explain your reasoning
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The value of x that makes m parallel to n is 90 degrees.
The value of x that makes m and n parallel is 15.
How to find the angles in parallel lines?
When parallel lines are cut by a transversal line, angle relationships are formed such as corresponding angles, alternate angles, vertically opposite angles etc.
The value of x that makes the line ma and n parallel can be calculated as follows:
180 - x = x (alternate exterior angle)
180 = 2x
x = 180 / 2
x = 90 degrees
2.
3x - 15 + 150 = 180(supplementary angles)
3x = 180 - 150 + 15
3x = 45
x = 45 / 3
x = 15
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Directions: write an appropriate equation for the given graph using your knowledge of parent functions and (h,k)
Answers
The parent functions are defined with all coefficients with value 1.
They can be linear, quadratic, cubic, absolute, reciprocal, exponential, logarithmic, square root, sine, cosine, tangent...
Then we can pick a function and transform it in order to include the point (-1,5) in the function definition.
We will use the quadratic parent function:
[tex]y=x^2[/tex]We will adjust the coefficient a of the quadratic function in order to include (-1,5)
[tex]\begin{gathered} y=a\cdot x^2 \\ 5=a(-1)^2=a \\ a=5 \end{gathered}[/tex]Then, our transformed function is:
[tex]y=5a^2[/tex]
It cost Angel $6.75 to send 75 text messages. How much does it cost to send one text?
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0.09x75=6.75 it costs ¢9 to send one text
To know how much each message sent costs, knowing that 75 messages cost $6.75, we only have to divide the cost of the total of 75 text messages by the total number of the cost of the message,
So that:
$ 6.75 ➗75 text message = 0.09 $/text messagesWe say, that the cost of each text message is $0.09.
four coworkers are discussing their birthdates what is the probability of the months being different?
Answers
The probability of four coworkers having different birth months is 0.572 or 55/96
Given there are four coworkers and the condition is they should have different birth months.
As we know probability is the ratio of favorable out comes to the total number of outputs
Favorable outcomes are
For first person 12 months
For second person 11 months
For third person 10 months
For Fourth person 9 months
Total outcomes
For each and every person total outcomes are 12 months which add up to 12 x 12 x 12 x 12 = [tex]12^{4}[/tex]
Now probability will be
Probability = [tex]\frac{(12)(11)(10)(9)}{12^{4} }[/tex]
Probability = 55/96
Hence the probability of four coworkers having different birth months is 55/96
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In this diagram, angle ABC has been mapped onto angle A'B'C' by a series of rigid motions. Which statement best describes one way to prove that the triangles are congruent?
A) Rigid motions preserve distance and angle measure. This means that AB approximately= A'B', BC approximately=B'C', and angle A approximately= angle A', so the triangles are congruent by SAS.
B) Rigid motions preserve distance and angle measure. This means that AB approximately= A'B', BC approximately=B'C', and angle B approximately= angle B', so the triangles are congruent by SAS.
C) Measure the areas of angle ABC and angle A'B'C' to confirm that their areas are equal. This means that AB approximately= A'B', BC approximately= B'C', and AC approximately= A'C', so the triangles are congruent by SSS.
D) Measure the perimeters of angle ABC and angle A'B'C' to confirm that their perimeters are equal. This means that AB approximately= A'B', BC approximately= B'C', and AC approximately= A'C', so the triangles are congruent by SSS.
Answers
The correct answer is Option B.
GХLauren has a full box of sugar cubes. The box is a rectangular prism with measurements, in centimeters,as shown. The size of each sugar cube is 1 cubic centimeter.2 cmSugar Cubes3 cm-4 cmFelect the numbers from the drop-down menus to complete each sentence.he volume of the box is measured in Choose...num
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To find the volume of the prism we just multiply all the measures
[tex]\begin{gathered} V=2\cdot3\cdot4 \\ \\ V=24\text{ cm}^3 \end{gathered}[/tex]The volume is 24 cm³
If the sugar cubes have 1 cm³ of volume, to find how much sugar cubes fit in the box we must divide the volume of the box by the volume of the sugar cubes
[tex]\frac{V}{V_S}=\frac{24\text{ cm}^3}{1\text{ cm}^3}=24[/tex]Therefore we can fit 24 sugar cubes
-1.4 + {-1.2}
Answer in decimals
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3000 for 2 years at 2% compounded quarterly
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Based on the given parameters, the amount of the investment after 2 years is $3123
How to determine the amount?The given parameters about the compound interest are
Principal Amount, P = $3000
Interest Rate, R = 2%
Time, t = 2
Number of times, n = 4 i.e quarterly
Compound interests are different from simple interest, and they are calculated using the following compound interest formula
CI = P(1 + R/n)^nt - P
To calculate the amount, we have:
A = P + CI
So, the equation becomes
A = P + P(1 + R/n)^nt - P
Evaluate the like terms
A = P(1 + R/n)^nt
Substitute the known values in the above equation
A = 3000 * (1 + 2%/4)^(2 * 4)
Express 2% as decimal
A = 3000 * (1 + 0.02/4)^(2 * 4)
Evaluate the sum
A = 3000 * (1.005)^8
Evaluate the exponent
A = 3000 * 1.041
Evaluate the product
A = 3123
Hence, the value of the investment is $3123
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4. Find the length of a cylinder of volume 2 litres and radius 10 cm.
5. Find the radius of a cylinder of volume 45 cm³ and length 4 cm.
Remember 1
Answers
length of a cylinder of volume 2 litres and radius 10 cm is 0.0064cm and the radius of a cylinder of volume 45 cm³ and length 4 cm is 1.8928cm.
PART A
Volume of Cylinder = 2 Litres
Radius of cylinder = r = 10 cm
We need to find the length of a cylinder .
We know , Volume of Cylinder = π[tex]r^{2} h\\[/tex]
On substituting the values of Volume of Cylinder and r , we get
2 = π( [tex]10^{2}[/tex])h
h = 2 / 100π = 0.0064 cm
Here h = length of a cylinder
The length of a cylinder is 0.0064cm .
PART B
radius of a cylinder = r
volume of cylinder = 45 cm³
length of cylinder = h = 4 cm
Volume of Cylinder = π[tex]r^{2} h\\[/tex]
45 = 3.14 [tex]r^{2}[/tex] (4)
[tex]r^{2}[/tex] = 3.5828
r = 1.8928
Radius of a cylinder is 1.8928cm.
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create an inequality expression with square root 8 and square root 16/2 thats shows how they compare
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We are given the following two numbers to compare
[tex]\sqrt[]{8}\quad and\quad \frac{\sqrt[]{16}}{2}[/tex]Let us simplify them
[tex]\begin{gathered} \frac{\sqrt[]{16}}{2}=\frac{4}{2}=2\quad (\text{this is smaller)} \\ \sqrt[]{8}=2.828\quad (\text{this is greater)} \end{gathered}[/tex]So, we can compare them as
[tex]\sqrt[]{8}>\frac{\sqrt[]{16}}{2}[/tex]The quantity on the left side is greater than the quantity on the right side.
What is the slope of the line that passes through the points (10, 4)(10,4) and (7, 3)(7,3)? Write your answer in simplest form.
Answers
The slope of the line that passes through points (10,4) and (7, 3) is 1/3
Here we are dealing with a slope of a line where a slope of a line is the change in the y coordinate with regard to the change in the x coordinate. If P(x1,y1) and Q(x2,y2) are the two points on a straight line, at that point the slope formula is given by:
m = Change in y-coordinates/Change in x-coordinates
m = (y₂– y₁)/(x₂ – x₁)
Since we are given two points (10,4) and (7, 3), where x₁ and x₂ are 10, 7 whereas y₁ and y₂ are 4, 3
From the formula we get,
m = (y₂-y₁)/(x₂-x₁)
= ( 3-4)/(7 - 10)
= -1/-3
=1/3
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I am a block.I have I flat surfaceI have I curved surface
Answers
the shape of the curved surface is the sphere
So, as a part of the shape is flat
The block may represents a semi sphere
What is the difference in
|-3| and -3
Answers
Answer:
6, because anything inside | | are positive so -3 will now be 3.
3 minus -3 = 6
Step-by-step explanation:
Hope it helps! =D
on the grid, draw 3 triangles with an area of 12 square units.Label the base and height of each triangle
Answers
Answer:
Iiiieie I just got off your phone with weee
Step-by-step explanation: why did I get a hold for him or
oh yeah that’s fine I’ll let lol I was thinking of going out to the house for the next few weeks so I’m not good enough for that lol I think it’s so so to do that all day and you can get a hold on you for sure and I can help with your stuff and help me help help you get it
PLEASE HELP … Would really appreciate it
Answers
The diameter of the outer circle = 12.907 ft
The thickness of the circular pipe = 2.983 ft
The diameter of the inner circle = q = The diameter of the outer circle - The thickness of the circular pipe
⇒ The diameter of the inner circle = 12.907 - 2.983 ft
⇒ The diameter of the inner circle = q = 9.924 ft
What is a Circle?All points in a plane that are at a specific distance from a specific point, the center, form a circle. In other words, it is the curve that a moving point in a plane draws to keep its distance from a specific point constant. The radius of a circle is the separation between any point on the circle and its center.A circle, specifically, is a straightforward closed curve that separates the plane into its inner and exterior.In common parlance, the word "circle" can apply to either the figure's boundary or its entirety, including its inside; in rigorous technical parlance, the circle only refers to the boundary, and the entire shape is referred to as a disc.To learn more about Circles, refer to:
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Translate the sentence into an equation.
The sum of 4 times a number and 5 is 2.
Use the variable y for the unknown number
Answers
Answer:
4y + 5 = 2
Step-by-step explanation:
4y + 5 = 2 Subtract 5 from both sides
4y = -3 Divide both sides by 4
y = [tex]\frac{-3}{4}[/tex]
Answer:
4y+5=2
Step-by-step explanation:
First, replace "a number" with "y"
The sentence becomes: "The sum of 4 times y and 5 is 2"
Replace "is" with the equals sign, "="
The sentence becomes: "The sum of 4 times y and 5 = 2"
Replace "times" with the multiply symbol, " * "
The sentence becomes: "The sum of 4 * y and 5 = 2"
Replace "the sum of ___ and ___" with " ___ + ___"
The sentence becomes: "4*y + 5 = 2".
the " * " isn't needed since 4y implies multiplication already, so you can optionally remove the *
which value of a make the solution of the equation 3(2x-4) = 4(ax-2)
Answers
The value of a that makes the solution of the equation is 1/2.
Given,
The equation: 3(2x - 4) = 4(ax - 2)
Solve,
3(2x - 4) = 4(ax - 2),
Open the bracket and multiply:
6x - 12 = 4ax - 8
Add 12 to both sides
6x -12 + 12 = 4ax + 12 - 8
We get,
6x = 4ax + 4
Add - 4ax to both sides:
6x - 4ax = 4ax - 4ax + 4
We get,
6x - 4ax = 4
Take x = 1
Then,
6 × 1 - 4a × 1 = 4
6 - 4a = 4
Now,
Add - 6 to both sides
6 - 6 - 4a = 4 - 6
We get,
-4a = -2
That is,
4a = 2
a = 2/4 = 1/2
That is,
The value of a that makes the solution of the equation is 1/2.
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solve for x
8x=4x−32
Answers
Substract 4 on each side
4x=-32
divide -32/4
X = 8
Answer:
[tex]x = - 8[/tex]
Step-by-step explanation:
[tex]8x = 4x - 32 \\ 8x - 4x = - 32 \\ 4x = - 32 \\ x = - 8[/tex]
Trisha's puppy weighs 5 pounds. How many ounces does her puppy weigh?
80 ounces
60 ounces
50 ounces
40 ounces
I NEED TO KNOW NOW PLS HURRY
Answers
5pounds= 80 ounces
The heights of 10 year old children has a normal probability distribution with mean of 54.6 inches and standard deviation of 5.7 inches. What is the approximate probability that a randomly selected 10-year old child will be more than 51.75 inches tall?
Answers
The approximate probability that a randomly selected 10-year-old child will be more than 51.75 inches tall is 0.6915.
How to calculate the probability?Probability refers to potential. A random event's occurrence is the subject of this area of mathematics. The range of the value is 0 to 1. From the information, the heights of 10-year-old children have a normal probability distribution with a mean of 54.6 inches and standard deviation of 5.7 inches.
Based on this, the probability that a randomly selected 10-year old child will be more than 51.75 inches tall will be:
P(X > 51.75)
= P(Z > [(number - mean) / standard deviation)]
= P(Z > [(51.75 - 54.6) / 5.7)]
= P(Z > -0.5)
= 1 - P(Z = -0.5)
This will be looked at in the z table.
= 1 - 0.3805
= 0.6915
Therefore, the probability is 0.6915.
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