Answer:
C. -18
Step-by-step explanation:
Scalar Product (Dot Product) of two vectors
[tex]\displaystyle \vec{a} \cdot \vec{b}=\sum_{i=1}^na_ib_i[/tex]
[tex]\textsf{If }\: \vec{a}=a_1\hat{i}+a_2\hat{j}+a_3\hat{k} \quad \textsf{and } \quad \vec{b}=b_1\hat{i}+b_2\hat{j}+b_3\hat{k}[/tex]
[tex]\textsf{then }\quad \vec{a} \cdot \vec{b}=a_1b_1+a_2b_2+a_3b_3[/tex]
Given:
v₁ = (3, -4)v₂ = (2, 6)⇒ v₁ · v₂ = (3 · 2) + (-4 · 6)
⇒ v₁ · v₂ = 6 + (-24)
⇒ v₁ · v₂ = 6 - 24
⇒ v₁ · v₂ = -18
sin^4 x+2sin^2 x-3=0
Solve by factoring on [0,2pi]
Answer:
Step-by-step explanation:x=π2,3π2
Explanation:
This can be factored as (x2+a)x2+b).⇒(sin2x+3)(sin2x-1)=0⇒
2
x
=
−
3
and
sin
2
x
=
1
⇒
sin
x
=
√
−
3
and
sin
x
=
√
1
⇒
sin
x
=
∅
and
sin
x
=
±
1
⇒
x
=
π
2
,
3
π
2
Hopefully this helps!
A grandsons age in years is equal to his grandfather's age in years. The difference of the grandsons age in years and the grandfather's age in years is 77. Find the grandsons age in years.
The age of the grandson is 7 years and the grandfather is 84 years if the grandson's age in months is equal to the age of grandpa in years and the difference in age is 77.
What is a linear equation?It is defined as the relation between two variables, if we plot the graph of the linear equation we will get a straight line.
If in the linear equation, one variable is present, then the equation is known as the linear equation in one variable.
Let's suppose the age of the grandsons is x years and
age of the grandfather's age is y years
Here some data are misprinted, so we are assuming the grandson's age in months is equal to the age of grandpa in years and the difference in age is 77.
Then according to the problem:
12x = y (as in 1 year, there are 12 months)
y -x = 77 (as difference in age is 77)
After solving both equations, we get:
x = 7 years and y = 84 years
Thus, the age of the grandson is 7 years and the grandfather is 84 years if the grandson's age in months is equal to the age of grandpa in years and the difference in age is 77.
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Solve the question within the screenshot please
Answer:
See below in bold.
Step-by-step explanation:
Let t be the number of tulips you buy and r be the number of rose bushes.
a.
The system is:
t + r = 13
4t + 10r = 100
b.
Solving:
4t + 10r = 100
t + r = 13 Multiply this by 4:
4t + 4r = 52 Subtract this from the first equation:
0 + 6r = 48
r = 8.
Now substitute for r in t + r = 13:
t + 8 = 13
t = 5.
c.
To buy 13 plants and spend $100 you need to buy 5 tulips and 6 rose bushes.
PLSSS HELP IF YOU TURLY KNOW THISS
Answer:
I believe that is the diameter.
Answer:
C. Diameter
Step-by-step explanation:
Circumference: The distance around the edge outside of the circle.
Diameter: The distance across the circle that goes through the center.
Radius: The distance halfway across the circle, which is half the diameter.
Center: The point or dot in the middle of a circle.
Solve for [x]. The pair of polygons are similar.
5x+2
B
16
The scale factor from A to B is 2:9
What is ur fav.
1) Chocolate 2) Vanilla 3) Strawberry 4) Mint Chocolate Chip 5) Cotton Candy 6) Coffee
Pick a number and put your name in the comments below with the number u picked
Answer:
cotton candy 6 I'm sure that's is answer thank youThe box plots below represent the scores for games played by two high school basketball teams over the last 5 seasons.
Based on these plots, which statement regarding the means of the two data sets is is most likely true?
A The mean score per game is higher for South County High School because the distribution of South County High School's scores is not as skewed as the distribution of Central High School's scores.
B The mean score per game is about the same for both schools because their median scores are about the same.
C The mean score per game is higher for Central High School than for South County High School because the distribution of Central High School's scores is skewed right and contains large outliers.
D No conclusion can be drawn regarding the means because the box plots only show medians and quartiles.
The mean score per game is higher for Central High School than for South County High School because the distribution of Central High School's scores is skewed right and contains large outliers.
What is mean?Mean is defined as the ratio of the sum of the number of the data sets to the total number of the data.
From the data given in the box plot, we can conclude that the mean score per game is higher for Central High School than for South County High School because the distribution of Central High School's scores is skewed right and contains large outliers.
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Lines m and n are parallel on a coordinate plane. Lines m and n are transformed by the same rotation, resulting in image lines s and t. Which statement describes the relationship between lines s and t? A. Lines s and t are intersecting but not perpendicular. B. The relationship between lines s and t cannot be determined without knowing the angle of the rotation. C. Lines s and t are parallel. D. Lines s and t are perpendicular.
The best statement that describes the relationship between lines s and t : (C). Lines s and t are parallel.
Meaning of Parallel linesA line can be defined as a figure that is one dimensional. It is a trace that is made by the movement of points in opposite direction.
Parallel lines can be defined as a group of lines that are of the same orientation. They face the same direction and are on the same axis.
In conclusion, The best statement that describes the relationship between lines s and t : Lines s and t are parallel.
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The points (−8,−2) and (7,4) are the endpoints of the diameter of a circle. Find the length of the radius of the circle.
Answer
8.08
Use the distance formula:
[tex]\sf d = \sqrt{(x_2 - x_1)^2 + (y_2-y_1)^2}[/tex]
where (x1, y1), (x2, y1) are points
[tex]\rightarrow \sf d =\sqrt{(7-(-8))^2 + (4-(-2))^2}[/tex]
[tex]\rightarrow \sf d =\sqrt{(15)^2 + (6)^2}[/tex]
[tex]\rightarrow \sf d =3\sqrt{29}[/tex]
This is the length of diameter.
Then radius:
· diameter/2
[tex]\sf \cdot \dfrac{3\sqrt{29} }{2}[/tex]
[tex]\sf \cdot 8.0777[/tex]
[tex]\sf \cdot 8.08 \ \ (rounded \ to \ nearest \ hundreth)[/tex]
Does the graph show a linear function?
DOES THE GRAPH SHOW A LINEAR FUNCTION?
[tex] \sf \large \color{grey}{YES IT SHOWS A GRAPHIC LINEAR}[/tex]
Answer:
yeah, cuz it's a line that's straight
What is the volume of this sphere?
Use a 3.14 and round your answer to the nearest hundredth.
4 m
cubic meters
radius= 4 m
to find:the volume of the given sphere.
solution:[tex]v = \frac{4}{3} \pi {r}^{3} [/tex]
[tex]v = \frac{4}{3} \times 3.14 \times {4}^{3} [/tex]
[tex]v = 267.9466667 \: {m}^{3} [/tex]
[tex]v = 267.95 \: {m}^{3} [/tex]
therefore, the volume of the given sphere is 267.95 cubic meters.
[tex]\large\boxed{\bold{Formula: V= \frac{4}{3}\pi{r}^{3}}}[/tex]
[tex]\large\boxed{\bold{\red\pi\red=\red3\red.\red1\red4}}[/tex]
In this question the radius is given so we'll simply have to substitute and solve.
Let's solve!
Substitute the values according to the formula.
Instead of π we are asked to use 3.14
[tex]V= \frac{4}{3}\times\ 3.14\times{4}^{3}[/tex]
Calculator answer:
[tex]\bold{V= 267.9466667 \:{m}^{3}}[/tex]
Now, we can round off to the nearest hundredth.
The value in thousandths place is greater than 5 so, we will have to round up by adding 1 to the hundredths place.
Final answer:
[tex]\large\boxed{\bold{V= 267.95 \: {m}^{3}}}[/tex]
Hence, the volume of the given sphere is 267.95 cubic meters.
Please Evaluate this equation
Answer:
Step-by-step explanation:
1.169
Answer:
8^2−38+85+3√8 =111+6√2
(Decimal: 119.485281)
Is c = 11 a solution to this equation? 3 c = 17
Answer:
a=17/33
Step-by-step explanation:
c=11a ----(1)
3c=17 ---- (2)
Substitute equation (1) into equation (2)
3(11a)=17
33a=17
Divide both side by 33
a=17/33
A person has an unknown element with a volume of 16 cubic inches and a weight of 4.13 pounds.
Density
Titanium 0.161
Zinc 0.258
Iron 0.284
Silver 0.379
Using the table, what is the element?
A.Zinc
B.Silver
C.Iron
D.Titanium
The density become by the elemental composition of the person has will be 0.258 and hence, option (A) will be correct.
What is the density?In science, density is defined as the ratio of an object's mass to volume. Technical and statistical density assessments are done using a technique. The theory is applicable to the laws of nature in sciences like physics, where the emphasis is on things and matter.
Because density affects so many aspects of life, comprehending it is crucial. Which cells will float high in the atmosphere and which will sink lower depends on density, according to physics.
Given that the element has
Volume = 16 cubic inch
weight = 4.13 pound
Since density = weight / volume
density = 4.13/16
density = 0.258 which is matching through option (A) hence it will be correct.
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whats 6 divided by 161?
Answer:
0.03
Step-by-step explanation:
You can do this on a calculator.
6 ÷ 161 = 0.0372670807
Hope this helped
Solve the following linear equation: 6(x-3)=18
Answer:
x=6
Step-by-step explanation:
6(x-3)=18
Then divide both sides by 6
x-3=3
Add 3 to both sides
x=6
Answer:
x = 6
Explanation:
6(x-3) = 18use distributive property: a(b + c) = ab + ac
6x - 18 = 18change sides
6x = 18 + 18add integers
6x = 36divide both sides by 6
x = 6What is the surface area of the right cone below?
12
A. 123 sq. units
B. 141 sq. units
C. 64 sq. units
D. 143 sq. units
3-
The surface area of the right cone is 141 sq. units. The correct option is B. 141 sq. units
Calculating surface area of a coneFrom the question, we are to determine the surface area of the given right cone
The total surface area of a cone can be calculated by using the formula,
TSA = πrl + πr²
Where TSA is the total surface area
r is the radius
and l is the slant height
From the given information,
r = 3
l = 12
Putting the parameters into the formula, we get
TSA = (π×3×12) + (π ×3²)
TSA = 36π + 9π
TSA = 45π sq. units
TSA = 141.37 sq. units
TSA ≅ 141 sq. units
Hence, the surface area of the right cone is 141 sq. units. The correct option is B. 141 sq. units
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Problema 2 (Reto) Considera que Nueva York y Londres están ubicadas a la misma latitud. Utilizando la información del radio de la tierra y lo aprendido hasta ahora, calcula distancia aproximada que separa las dos ciudades, especificando cada uno de los razonamientos seguidos en tu estrategia de solución.
Bajo la suposición de que las ciudades se hallan en la misma latitud, la distancia estimada entre las dos ciudades es de aproximadamente 6814 kilómetros.
Cómo se estima la distancia entre dos ciudades
En esta pregunta asumimos que la Tierra tiene una geometría esférica, de modo que los cálculos de arcos circulares se pueden obtener de manera simple y ágil. Por otra parte, también asumimos que las que la ciudad de Londres se encuentra a la misma latitud que la ciudad de Nueva York.
Es posible determinar la distancia estimada mediante la siguiente ecuación de arco circular:
s = [(θ' - θ) · π/180] · R · cos α (1)
Where:
θ' - Longitud de la ciudad de Londres, grados.θ - Longitud de la ciudad de Nueva York, en grados.α - Latitud de la ciudad de Nueva York, en grados.R - Radio ecuatorial de la Tierra, en kilómetros.Si sabemos que θ' = 7°, θ = - 73°, α = 40° y R = 6371 km, entonces la distancia estimada entre la ciudades de Nueva York y Londres es:
s = [(7+73)/180] · π · (6371 · cos 40°)
s ≈ 6814.420 km
Bajo la suposición de que las ciudades se hallan en la misma latitud, la distancia estimada entre las dos ciudades es de aproximadamente 6814 kilómetros.
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Which linear function represents the line given by the point-stope equation y-2= 4(x-3)?
f(x) - 6x-1
f(x)=Bx-6
(((x)-4x-14
(/(x)-4x-10
The linear function that represents the line y - 2 = 4(x - 3), in slope-intercept form, is expressed as: D. f(x)y = 4x - 10.
What is a Linear Function Equation?A linear function equation is expressed as, y = mx + b, in slope-intercept form.
Given the point-slope equation of the function, y - 2 = 4(x - 3), rewrite in slope-intercept form:
y - 2 = 4(x - 3)
y - 2 = 4x - 12
y = 4x - 12 + 2
y = 4x - 10
The linear function would be: D. f(x)y = 4x - 10
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what is the absolute vale of |-18|
Answer:
18
Step-by-step explanation:
the absolute value is 18
Identify the amount (a) and the growth factor (b) in each exponential function. Break B into (1+r) where the rate of growth. Give r as a percentage.
y=1.07 (1.96)x
a
b=
r(as a percentage)
Answer:
a = 1.07
b = 1.96
r = 96%
Step-by-step explanation:
In an exponential function, modeled by f(x) = a(b)ˣ, a is the initial value and b is the growth factor. If we apply this formula to the given function y = 1.07(1.96)ˣ, we can see that the initial value, a, is 1.07, and the growth factor, b, is 1.96.
Now, to break down b, 1.96, into a rate, you simply set it equal to the problem’s given (1 + r) equation to find the rate.
1.96 = 1 + r
So r = .96
Now, we just have to convert .96 into a percentage to get a growth rate of 96%.
Mike wants to be elected president of the 7th-grade student council. he wants to determine his chance of winning the election. which would be the best way for mike to determine if he will win the election?
Answer:
B. survey a random sample of 7th-grade students
Step-by-step explanation:
this answer would make the most sense because it is a example of a random statistical question.
how do you do 7.8 plus 917.62
The value of the addition of the numbers 7.8+917.62 will be 925.42.
What is addition?The method of increasing the number is called the addition. or the sum of the two numbers is termed as the addition.
The addition of the numbers will be done as:-
917.62
+7.80
925.42
First, arrange the number one to another then add from the unit places you will get your answer.
So the addition of the numbers will be 925.42
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You are in charge of snacks for a youth event. You send your cousin Norm who is a complete nerd to
the store to price some items for you. For some inexplicable reason instead of telling you the price
for each item, he gives you this information:
If you buy 3 bags of Reese's Peanut Butter Cups and 6 bags of York Peppermint Patties, it costs $48.
If you buy 4 bags of Reese's Peanut Butter Cups and 3 bags of York Peppermint Patties, it costs $51.
Figure out how much each single bag costs. (Do not enter a $, just the number)
Reese's Peanut Butter Cups:
York Peppermint Patties:
Answer:
Reese's Peanut Butter Cups: 10.8
York Peppermint Patties: 2.6
Step-by-step explanation:
Let Reese's Peanut Butter Cups be r and York Peppermint Patties y.
Step 1: Make equations.
1) If you buy 3 bags of Reese's Peanut Butter Cups and 6 bags of York Peppermint Patties, it costs $48.
[tex]3r + 6y = 48[/tex]
2) If you buy 4 bags of Reese's Peanut Butter Cups and 3 bags of York Peppermint Patties, it costs $51.
[tex]4r + 3y = 51[/tex]
Step 2: Solve the system of equations.
We have system of equations. I'll solve them by elimination.
[tex](1.) \text{ } 3r + 6y = 48\\(2.) \text{ } 4r + 3y = 51[/tex]
Multiply the second equation with 2 so we'll get 6y.
[tex](1.) \text{ } 3r + 6y = 48\\(2.) \text{ } 8r + 6y = 102[/tex]
Now let's subtract second equation from first and solve for r.
[tex]3r - 8r + 6y - 6y = 48 - 102\\-5r = -54\\r = \frac{-54}{-5}\\r = \$10.8[/tex]
To get y let's substitute the value of r in first equation.
[tex]3r + 6y = 48\\3 \cdot 10.8 + 6y = 48\\32.4 + 6y = 48\\6y = 15.6\\y = \$2.6[/tex]
Evaluate the following expressions for x=2, y=3 and z=-2
a). 2(x-y)
b). 4x+3y-z
C). -2(3z+y)
[tex]\text{Given that}~ x = 2,~ y = 3 ~ \text{and}~ z = -2\\\\\textbf{a)}\\\\2(x-y)=2(2-3) = 2(-1) = \boxed{-2}\\\\\textbf{b)}\\\\4x+3y-z = 4(2) +3(3) -(-2) = 8+9+2=\boxed{19}\\\\\textbf{c)}\\\\-2(3z+y) = -2[3(-2) +3] = -2(-6+3) = -2(-3) = \boxed{6}[/tex]
A class has 45 students. Each student has either 5 dollars or 2 dollars. Which Which situation results in the class having an average of 3 dollars per student
Step-by-step explanation:
an average of $3 per student would mean
sum(all students $) / 45 = 3
sum(all students $) = 3×45 = 135
x students have $5.
therefore (45-x) students have $2.
5x + 2(45-x) = 135
5x + 90 - 2x = 135
3x = 45
x = 15
so, 15 students have $5, and 45-15 = 30 students have $2.
ever heard of someone having "a ___ on their shoulder?
The level of college education and wages earned are known to have a strong positive association. karen concluded that a college education causes higher earnings. is karen's conclusion valid? explain. karen's conclusion is not valid because association does not imply causation. karen's conclusion is valid because association does imply causation. karen's conclusion is not valid because causation does not imply association. karen's conclusion is valid because causation does imply association.
karen's conclusion is valid because the association does imply causation.
What is an association claim?An association claim asserts that a particular level of one variable is expected to be related to a specific level of another variable. As two variables are related, they are said to be correlated, which means that when one variable varies, the other variable tends to change as well.
An association claim must include at least two variables that are measured rather than manipulated.
While an association claim just acknowledges a connection between two variables, a causal claim goes a step further by claiming that one of the factors is responsible for altering the other.
Therefore, we can conclude that the claim which states that:
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Answer:
Association does not equal Causation, since Karen's theory does not have any evidence to prove causation, her theory is invalid.
Step-by-step explanation:
PLEASE HELP ME LOL. (2.4 x 10^5) + (6 x 10^²) =?
Answer:
240,600
Step-by-step explanation:
10⁵=100,000
2.4×100,000=240,000
10²=100
6×100=600
240,000+600=240,600
somebody please help me
Answer:
1/3
1/2
Step-by-step explanation:
Sum being greter than 8, means 9,10,11,12 (12 is max as 6+6)
You can get 9 in these ways, (6+3),(5+4),(4+5),(3+6)
For 10, (6+4),(5+5),(5+5),(4+6)
For 11, (6+5),(5+6)
For 12 (6+6),(6+6)
Each outcome has probability of 1/6 x 1/6 = 1/36
There are 12 outcomes hence 12(1/36) = 12/36 = 1/3
Part b is 1/2 because half of dice has odd numbers.