In what instance would you use the upside down U when doing interval notation

Answers

Answer 1
The U and inverted U symbols, ∪ and ∩, are mathematical symbols used to denote union or intersection, respectively. For example, when a rational algebraic equation is graphed, there may be some points where the equation is undefined. Visually, we see it as breaks or discontinuities. We use the ∪ symbol to express union. For example, {-∞,2)∪(4,+∞). That means that the graph passes at all x values except x=3.

The ∩ symbol is used for intersection of two lines, for instance. When equation A and equation B are graphed, they can intersect at points (x,y). It is therefore expressed as: A∩B = (x,y).

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One serving of granola provides 4% of the protein you need daily. You must get the remaining 48 grams from other sources. How many grams of protein do you need daily?

Answers

48 grams= 96% needed

x grams. = 4%

Set up a proportion

48/96 = x/4

96/24=4
48/24=2
x=2= grams in the granola

Add the value of 96% and the value of 4% to get the value of 100%

2+48=50

Final answer: 50 grams

Cos (pi/11)+cos (3pi/11)+cos (5pi/11)+cos (7pi/11)+cos(9pi/11)

Answers

Answer:

1/2

Step-by-step explanation:

The third term of an arithmetic sequence is 21, and the eighth term is 56. The first term is _____.

Answers

The first term is 7. This is because the sequence has a pattern of increasing by 7. If the first term was 7, the second would be 14, the third would be 21. The 4th would be 28, continue to the 8th term 56.
Final answer:

The first term of the given arithmetic sequence is 7. This can be determined by finding the common difference and moving backwards from the third term using this value.

Explanation:

The subject of this question is Arithmetic Sequence which is a topic in mathematics. An arithmetic sequence is defined by a common difference (d) between consecutive terms.

To solve this problem, we have to find the common difference first. The difference between the 8th term (56) and the 3rd term (21) is 35. But since there are 5 steps from the 3rd term to the 8th term, each step (or the common difference) must be 35 ÷ 5 = 7.

Now that we have the common difference (7), we can reverse it from the 3rd term (21) back to the 1st term which gives us: 21 - 2(7) = 7. So, the first term is 7.

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If 4 is subtracted from twice a number, the result is 10 less than the number. Write an equation to solve this problem. Use n as the variable to represent the number.

Answers

2n-4= n-10
-n. -n
n-4=-10
+4. +4
n=-6

Final answer: -6

Jason deposits $5,000 in a bank account that will pay him 4% simple interest annually. If Jason deposits no more than the initial 5,000 , how much money will be in the account at the end of 5 years ?

Answers

F=I(1+rt), F=final amount, I=initial amount, r=rate, t=time

Here I=$5000, r=(4/100)=0.04 so

F=$5000(1+0.04t)  so after 5 years...

F=$5000(1+0.2)

F=$6000

Find the area of the shaded region when r = 4 feet and the area of the triangle is: 123√ square feet
Use 1.73 for 3√ and 3.14 for π. Round your answer to two decimal places.

Answers

Area of the shaded region :
A ( shaded ) = A ( circle ) -  A ( triangle ) =
= r² π - 12 √ 3 =
= 4² π - 12 √ 3 =
= 16 π - 12 √ 3 =
= 16 · 3.14 - 12 · 1.73 =
= 50.24 - 20.76 = 29.48
Answer: Area of the shaded region is 29.48 ft².

Find the taylor polynomial t3(x) for the function f centered at the number

a. f(x) = e^(â3x) sin(2x), a = 0

Answers

[tex]e^{-3x}=\displaystyle\sum_{n=0}^\infty\frac{(-3x)^n}{n!}=1-3x+9x^2+\cdots[/tex]
[tex]\sin2x=\displaystyle\sum_{n=0}^\infty\frac{(-1)^n(2x)^{2n+1}}{(2n+1)!}=2x-\dfrac{4x^3}3+\cdots[/tex]

[tex]e^{-3x}\sin2x=\left(1-3x+9x^2+\cdots\right)\left(2x-\dfrac{4x^3}3+\cdots\right)[/tex]
[tex]\approx T_3(x)=(1-3x+9x^2)\left(2x-\dfrac{4x^3}3\right)[/tex]
[tex]T_3(x)=2x-6x^2+\left(18-\dfrac43\right)x^3[/tex]
[tex]T_3(x)=2x-6x^2+\dfrac{50}3x^3[/tex]

a commercial jet airplane climbs at takeoff with slope m=4/9. How far in the horizontal direction will the airplane fly to reach am altitude of 20,000 ft above the takeoff point?

Answers

[tex]\bf slope = {{ m}}= \cfrac{rise}{run}\implies \cfrac{\textit{vertical direction}}{\textit{horizontal direction}}\implies \cfrac{4}{9}=\cfrac{20000}{h}[/tex]

solve for "h".

The horizontal direction in will the airplane flies to reach an altitude of 20,000 ft above the takeoff point will be 45,000 feet.

What is a linear equation?

A relationship between two or more parameters that, when shown on a graph, produces a linear model. The degree of the variable will be one.

The linear equation is given as,

y = mx + c

Where m is the slope of the line and c is the y-intercept of the line.

A commercial jet airplane climbs at takeoff with slope m = 4/9.

Then the equation of the line will be given as,

y = (4/9)x

The y-intercept is zero.

The horizontal direction will the airplane fly to reach an altitude of 20,000 ft above the takeoff point will be

20,000 = (4/9)x

180,000 = 4x

x = 180,000 / 4

x = 45,000 feet

The horizontal direction in will the airplane flies to reach an altitude of 20,000 ft above the takeoff point will be 45,000 feet.

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Three students simplified the expression 2x- 3(y-2x) +-5times -2y.
Amber -4y + 7y
Butch 4x + 7y
Carl 8x + 7y

Who is correct? Explain the error the other students made

Answers

Carl is right because simplifying it gets us: [tex]2x-3y+6x+10y=8x+7y[/tex]

((81x^3 y^(-1/3))^1/4)/(x^2 y)^1/4 simplify

Answers

[tex]\bf a^{\frac{{ n}}{{ m}}} \implies \sqrt[{ m}]{a^{ n}} \qquad \qquad \sqrt[{ m}]{a^{ n}}\implies a^{\frac{{ n}}{{ m}}} \\\\\\ \left.\qquad \qquad \right.\textit{negative exponents}\\\\ a^{-{ n}} \implies \cfrac{1}{a^{ n}} \qquad \qquad \cfrac{1}{a^{ n}}\implies a^{-{ n}} \qquad \qquad a^{{{ n}}}\implies \cfrac{1}{a^{-{{ n}}}}\\\\ -------------------------------\\\\[/tex]

[tex]\bf \cfrac{\left( 81x^3y^{-\frac{1}{3}} \right)^{\frac{1}{4}}}{(x^2y)^{\frac{1}{4}}}\implies \cfrac{81^{\frac{1}{4}}x^{3\cdot {\frac{1}{4}}}y^{-\frac{1}{3}\cdot {\frac{1}{4}}}}{x^{2\cdot {\frac{1}{4}}}y^{\frac{1}{4}}}\implies \cfrac{81^{\frac{1}{4}}x^{\frac{3}{4}}y^{-\frac{1}{12}}}{x^{\frac{2}{4}} y^{\frac{1}{4}}}[/tex]

[tex]\bf \cfrac{81^{\frac{1}{4}}x^{\frac{3}{4}}x^{-\frac{2}{4}}}{ y^{\frac{1}{4}}y^{\frac{1}{12}}}\implies \cfrac{(3^4)^{\frac{1}{4}}x^{\frac{3}{4}-\frac{2}{4}}}{y^{\frac{1}{4}+\frac{1}{12}}}\implies \cfrac{3^{4\cdot \frac{1}{4}}x^{\frac{1}{4}}}{y^{\frac{4}{12}}}\implies \cfrac{3^{\frac{4}{4}}x^{\frac{1}{4}}}{y^{\frac{1}{3}}} \\\\\\ \cfrac{3\sqrt[4]{x}}{\sqrt[3]{y}}[/tex]

Most teachers enjoy teaching students. Most teachers are college graduates. Assuming these two statements are true, do some college graduates enjoy teaching students?

Answers

in the two given statements we can conclude that yes some college graduates do indeed teaching students.

Answer:

yes some some college graduates enjoy teaching students.

Step-by-step explanation:

This question is based on reasoning.

Most teachers enjoy teaching students.

Most teachers are college graduates.

A syllogism is a form of logical reasoning formed by the joining of two or more premises to arrive at a conclusion.

So, here we can say that yes some some college graduates enjoy teaching students.

Compare the 3 in 536 to the 3 in 1,36 7.
Draw number 536 using base ten block?

Answers

For the number 536, the order of the numbers from left to right is "hundreds tens units", this means that the 3 is occupying the tens place.

For the number 1367. the order of the numbers from left to right is "thousands hundreds tens units", this means that the 3 is occupying the hundreds place.

As per the representation of 536 using base 10 blocks, it is shown in the attached picture:

Product A is an 8 oz bottle of cough medication that sells for $1.36. Product B is a 16oz bottle of cough medication that cost $3.20. Which product has the lower unit price

Answers

product a
^^^^^^^^^^^^^^^^

is a kiloliter greater than one liter

Answers

Hello Mikaila

Kiloliters is a metric unit of volume equivalent to 1000 liters or 1 cube meter.

-------------------------------------------------------------------------------------------
Yes, a kiloliter is greater than one liter.

------------------------------------
1 kiloliter = 1000 liters


I hope that helps!

A group of ladies meet for an afternoon tea party. They bring all their cats. In all, there are 26 heads and 84 feet. How many ladies and how many cats are in the room

Answers





X= ladies       y = number of cats 

Each lady has 2 feet and each cat has 4 feet 

<=> 

x + y = 26 (1) => number of characters 
2x + 4y = 84 (2) => number of feet 

<=> operation : (1) * 2 

2x + 2y = 52 (1') 
2x + 4y = 88 (2') 

<=> operation : (2') - (1') 

2y = 26 

<=> 

y = 20 and x = 32- 16 = 16

10 ladies and 16 cats
h=p+c  (heads equals the sum of people and cats) since there are 26 heads:

p+c=26, solve for c, subtract p from both sides

c=26-p, now for feet...

2p+4c=f, using c found above gives you:

2p+4(26-p)=f and we are told that there are 84 feet so:

2p+4(26-p)=84  perform indicated multiplication on left side

2p+104-4p=84, combine like terms on left side

-2p+104=84  subtract 104 from both sides

-2p=-20  divide both sides by -2

p=10, and since c=26-p

c=26-10

c=16

So there are 10 people and 16 cats in the room.


Find the volume of the wedge-shaped region contained in the cylinder x2 + y2 = 49, bounded above by the plane z = x and below by the xy-plane.

Answers

[tex]\displaystyle\iiint_R\mathrm dV=\int_{y=-7}^{y=7}\int_{x=-\sqrt{49-y^2}}^{x=0}\int_{z=x}^{z=0}\mathrm dz\,\mathrm dx\,\mathrm dy[/tex]

Converting to cylindrical coordinates, the integral is equivalent to

[tex]\displaystyle\iiint_R\mathrm dV=\int_{\theta=\pi/2}^{\theta=3\pi/2}\int_{r=0}^{r=7}\int_{z=r\cos\theta}^{z=0}r\,\mathrm dz\,\mathrm dr\,\mathrm d\theta[/tex]
[tex]=\displaystyle\int_{\theta=\pi/2}^{\theta=3\pi/2}\int_{r=0}^{r=7}-r^2\cos\theta\,\mathrm dr\,\mathrm d\theta[/tex]
[tex]=-\displaystyle\left(\int_{\theta=\pi/2}^{3\pi/2}\cos\theta\,\mathrm d\theta\right)\left(\int_{r=0}^{r=7}r^2\,\mathrm dr\right)[/tex]
[tex]=\dfrac{2\times7^3}3=\dfrac{686}3[/tex]

We have that

Volume of the  wedge-shaped region

[tex]W=228.65[/tex]

Attached below is a picture of the wedge-shaped region contained in the cylinder

Bearing in mind this shape, we have that the coordinates identifying the cylinder are as follows

Co-ordinates

[tex]0 \leq r \leq 7,\frac{\pi}{2} \leq 0 \leq \frac{\pi}{2},0 \leq z \leq x[/tex]

Where

[tex]0 \leq z \leq x =rcos \phi[/tex]

Generally the equation for the volume of the  wedge-shaped region W  is mathematically given as

[tex]\int \int \int_W 1dv=\int^{7}_{0} \int^{\frac{\pi}{2}}_{-\frac{\pi}{2}} \int^{rcos \phi}_{0}[/tex]

[tex]\int \int \int_W 1dv=\int^{7}_{0} r (\int^{\frac{\pi}{2}}_{-\frac{\pi}{2}}rcos\phi dv))dr[/tex]

[tex]\int \int \int_W 1dv=(\frac{(7)^3}{3}+\frac{(0)^3}{3})(sin {\pi/2}+sin{-\pi/2})[/tex]

[tex]\int \int \int_W 1dv=228.67[/tex]

Therefore

Volume of the  wedge-shaped region

[tex]W=228.65[/tex]

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A businessman has 10 employees. His salary is equal to 6 times the average of employees salaries. If the 11 of them receive a total of $64,000 in one year, what was the business mans salary that year ??

Answers

x = business man's salary
y = employee's salary

x + 10y = 64000
x = 6y

6y + 10y = 64000
16y = 64000
y = 64000/16 = 4000

x = 6*4000
x = 24000

 business man's salary was $24,000

Valerie predicts she will be able to hold her breath for 31 second while underwater. If she actually held her breath for 34 seconds, what was Valerie's percent error? Round your answer to the nearest tenth of a percent.

Answers

(predicted value - exact value)/exact value * 100
(31 - 34)/34 * 100 = 8.8%

If she actually held her breath for 34 seconds. Then the percentage error will be 8.82%.

What is the percentage error?

The amount of error is expressed as if it is a part of the total which is a hundred. The ratio can be expressed as a fraction of 100. The word percent means per 100. It is represented by the symbol ‘%’.

Valerie predicts she will be able to hold her breath for 31 seconds while underwater.

If she actually held her breath for 34 seconds.

Then the percentage error will be

[tex]\rm error \ \% = \dfrac{34-31}{34} \times 100\\\\\\error \ \% = \dfrac{3}{34} \times 100\\\\\\error \ \% = 8.82 \%[/tex]

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The volume of a rectangular prism is b3 + 8b2 + 19b + 12 cubic units, and its height is b + 3 units. The area of the base of the rectangular prism is square units.

Answers

Given:

The volume of the rectangular prism is 

[tex] b^{3}+8 b^{2} +19b+12 [/tex],

the height is h=(b+3)

1. The volume of a rectangular prism is (base area)*height

also, notice that the volume is a third degree polynomial, the height is a 1st degree polynomial, so the base area must be a 2nd degree polynomial, whose coefficients we don't know yet.
Let this quadratic polynomial be [tex](mb^{2}+nb+k)[/tex]

 
2

[tex]b^{3}+8 b^{2} +19b+12=(mb^{2}+nb+k)*(b+3)[/tex]


notice that  [tex]b^{3}[/tex] is the product of the largest 2 terms: [tex]mb^{2}[/tex] and b, so m must be 1

also, notice that 12 is the product of the constants, k and 3

so k*3=12, this means k=4

3
we write the above equality again:

[tex] b^{3}+8 b^{2} +19b+12=(b^{2}+nb+4)*(b+3)[/tex]


[tex](b^{2}+nb+4)(b+3)= b^{3}+3 b^{2} +nb^{2}+3nb+4b+12[/tex]

=[tex]= b^{3}+(n+3)b^{2}+(3n+4)b+12[/tex]


4
now compare the coefficient with the left side:

[tex]8 b^{2}=(n+3)b^{2}[/tex]

8=n+3

n=5


substituting n=5: 

the base area is [tex]b^{2}+5b+4 [/tex]

Answer: [tex]b^{2}+5b+4 [/tex]


Answer:

b^2 + 5b +4

Step-by-step explanation:

The formula for finding the circumference of a circle is C=2πrC=2πr . Rearrange the formula to solve for the radius (r).

Answers

C=2πr

Divide by 2π:

r = C/2π

The scores on an exam are normally distributed, with a mean of 74 and a standard deviation of 7. What percent of the scores are less than 81?The scores on an exam are normally distributed, with a mean of 74 and a standard deviation of 7. What percent of the scores are less than 81?

Answers

We are given the following variables:

Normal distribution

u = sample mean = 74

s = standard deviation of the samples = 7

x = sample value = 81

Since we are asked to find percent of the scores less than 81, this means we have to find the proportion using the z-score. The formula for z score is:

z = (x – u) / s

Substituting the given values:

z = (81 – 74) / 7

z = 1

Using the standard normal distribution tables for z, we find that:

P = 0.8413            at z = 1

Therefore this means that 84.13% of scores are less than 81.

The Answer is the two small boxes just got it right For Plato

FAR LEFT FAR RIGHT

The function f(x)=log[7]x is increasing. True or false

Answers

I would say that the answer is true

The given function increases as x increases, so the statement is true.

Is the function increasing?

Here we have the function:

[tex]f(x) = log_7(x)[/tex]

To see if it is increasing, we can evaluate in two values, 10 and 15, this will serve to see if the function is increasing or not:

[tex]f(10) = log_7(10) = 1.18\\\\f(15) = log_7(15) = 1.39[/tex]

As you can see, when x increases also does f(x), so the function is increasing.

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If the total price paid for an item is $20.25 and the cost of the item before sales tax is $18.90, what is the rate of sales tax?

Answers

20.25 -18.90 = 1.35

1.35 / 18.90 = 0.071428571

= 7.14%


check:

18.90 x 1.34946 Round to 1.35

18.90 + 1.35 = 20.25


 Sales tax = 7.14%

What is the estimate of 462,809+256,738

Answers

Hi, 
the estimate would be... 
500,000 + 300,000
your answer would be: 800,000.

I hoped I helped and if you need more you could always ask me :)
-Dawn

how do you make a equivalent ratio?

Answers

[tex]\bf Rowley\quad 16:14\implies \cfrac{16}{14}\qquad Rivera\quad 64:60\implies \cfrac{64}{60} \\\\\\ \textit{so, simplifying both fractions } \begin{cases} \cfrac{16}{14}\implies \cfrac{8}{7}\\\\ \cfrac{64}{60}\implies \cfrac{16}{15} \end{cases}\qquad \cfrac{8}{7}\ne \cfrac{16}{15}[/tex]

A ratio is a rate. Sometimes always or never true

Answers

By definition, the ratio is the expression that would allow us to express the quotient of two numbers and/or any mathematical expressions. Let us take for example, numbers 4 and 5. The ratio between these values is 4/5. 

The statement given above, "A ratio is a rate" is only sometimes true. This is only true when the unit of measurement of the denominator is in terms of time (seconds, minutes, hours, years, etc) because this would tell us how fast is something being done, consumed, etc. Example, the speed or rate of a car is 4 meters / 5 seconds.

On a resent business trip it took 7 hours 30 minutes to drive 375 miles how many miles per hour was the average

Answers

divide 375 by 7.5 to get the answer

Answer:

50 miles / hours.

Step-by-step explanation:

Speed may be defined as the distance covered by the object per unit time.

Speed = [tex]\frac{distance}{time}[/tex]

the distance of the business trip = 375 miles.

the time taken by the business trip = 7 hours 30 minutes = 7.5 hrs.

Speed = [tex]\frac{375}{7.5}[/tex]

Speed = 50 miles / hours.

Here, the average of miler per hour is 50 miles / hours.

What type of graph would have the title, "Monthly Company Profit for the Year?"

bar graph
line plot
line graph
pictograph

Answers

line graph would suit this situation the best.

Answer:

line graph

Step-by-step explanation:

Simplify x^2-4x-32/x^2+7x+12

Answers

It equals to:

(x - 8)(x + 4) / (x+3)(x+4)

If x ≠ -4

Then it equals to:

(x-8) / (x+3)
Simplify x^2-4x-32/x^2+7x+12
Answer see form:

Find the value of 4 + (27 - 12·2) ÷ 2.
Answer's are 3.5,5.5 and 19
Which one is it

Answers

You follow the rule PEMDAS parenthesis, exponent, multipy, divide, add, substart. So you would start off by doing 27-12x2, you would do 12x2=24 first then 27-24=3. So then it would be 4+3/2, do 3/2=1.5, then add it 4+1.5=5.5. So the correct answer is 5.5

The value of 4 + (27 - 12·2) ÷ 2 would be 5.5.

What is simplification of an expression?

Usually, simplification involves proceeding with the pending operations in the expression.

Like, 5 + 2 is an expression whose simplified form can be obtained by doing the pending addition, which results in 7 as its simplified form.

A Simplification usually involves making the expression simple and easy to use later.

WE follow the rule PEMDAS parenthesis, exponent, multipy, divide, add, substart.

4 + (27 - 12·2) ÷ 2

4 + (27 - 24 ) ÷ 2

4 + (3) ÷ 2

4+3/2,  do 3/2=1.5

then add it

4+1.5 = 5.5.

Therefore, the correct answer is 5.5

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