Mathematics High School

is 4x-3=19 true, false, or open

Answers

Answer 1

True.

4x-3=19

4x=21 (add 3)

x=5.25 (divide both sides by 4)

Answer 2

Answer:

Open

Step-by-step explanation:

i just took the quick check

trust me

Related Questions

What the simplified form of x- 1 +4+7x-3

Answers

Collect like terms (x + 7x) + (-1 + 4 - 3)

Simplify

Answer: 8x

The volume of a cone varies jointly as the square of its radius and its height. if the volume of a cone is 99piπ cubic inches when the radius is 3 inchesinches and the height is 3 inches, find the volume of a cone when the radius is 4 inchesinches and the height is 9 inches.

Answers

Any answer choices ?

Varia is studying abroad in Europe. She is required pay $3,500 (in US dollars) per year to the university, however, she must pay in euros. How many euros can Varia expect to pay per month to the university? (Round to the nearest whole euro.)

Answers

It would be about 2938 Euros.

2940 euro's. i hope this helps

Lois and Clark own a company that sells wagons. The amount they pay each of their sales employees (in dollars) is given by the expression 12h+30w where h is the number of hours worked and w is the number of wagons sold. What is the amount paid to an employee that works 6 hours and sells 3 wagons?

Answers

Take 12 times 6 then take 30 times 3
So I get 72 and 90 then add those together your final answer should be 162

Diego says that the product of 0.51 * 2.427 will have have five decimal places. is Diego correct? Explain

Answers

I quickly worked it out and Diego is incorrect.

What is the integer of the square root of 70?

Answers

8*8 = 64
9*9 = 81

so integer part of sqrt 70 is 8 Answer

Find the principal amount invested if the amount in a monthly compounded account with a 5.1% interest rate is $9,996.32 after 54 months.

Answers

again, there are 12 months in a year, so 54 months is 54/12 years

[tex]\bf \qquad \textit{Compound Interest Earned Amount} \\\\ A=P\left(1+\frac{r}{n}\right)^{nt} \quad \begin{cases} A=\textit{accumulated amount}\to &\$9996\\ P=\textit{original amount deposited}\\ r=rate\to 5.1\%\to \frac{5.1}{100}\to &0.051\\ n= \begin{array}{llll} \textit{times it compounds per year}\\ \textit{monthly, thus twelve} \end{array}\to &12\\ t=years\to \frac{54}{12}\to &\frac{9}{2} \end{cases}[/tex]

[tex]\bf 9996=P\left(1+\frac{0.051}{12}\right)^{12\cdot \frac{9}{2}}\implies \cfrac{9996}{\left(1+\frac{0.051}{12}\right)^{12\cdot \frac{9}{2}}}=P[/tex]

Ivan can type 54 words in 3 minutes. At this rate, how many words can he type in 10 minutes?

Answers

Ivan can type 180 words

That means that Ivan can type 180 words in 10 minutes. :)

On the first of three tests sally scored 75 points. on the third test her score was one point more than the second test her average on the three test was 82 what were her scores on the second and third test

Answers

If her second test was x and her third was x+1 (since it was 1 more than the second), we get 75+x+x+1=76+2x as our total test scores. Next, to get the average you add up the numbers and divide it by the amount of numbers you have. Since we have 3 tests and our sum is 76+2x, we divide it by 3 to get (76+2x)/3=average=82. Multiplying both sides by 3, we get 246=76+2x. Next, we subtract both sides by 76 to get 170=2x. Lastly, we divide both sides by 2 to get 85=x= the second test score. Her third test score is x+1=85+1=86

Let f(x) = x2 and g(x) = x − 3. Evaluate (g ∘ f)(−2).

Answers

(g ∘ f)(−2) = g(f(-2))

f(-2) = (-2)^2 = 4
g(f(-2)) = 4 -3 = 1

answer

(g ∘ f)(−2) = 1

Answer:

The value of (g ∘ f)(-2) is 1

Step-by-step explanation:

Given two functions

[tex]f(x)=x^2, g(x)=x-3[/tex]

we have to evaluate (g ∘ f)(-2).

As, (g ∘ f)(-2)=g(f(x))

[tex]g(f(x))=g(x^2)[/tex]

As g(x)=x-3

[tex]g(x^2)=x^2-3[/tex]

Therefore,

[tex](g o f)(x)=x^2-3[/tex]

To find the value of (g ∘ f)(-2), we have to substitute x=-2

[tex](g o f)(-2)=(-2)^2-3=4-3=1[/tex]

Hence, the value of (g ∘ f)(-2) is 1

I need major help!!!!

What is the area of a circle with a diameter of 13.2 cm?
Use 3.14 for pi and round your final answer to the nearest hundredth.
Enter your answer in the box.

Which explanation can be used to derive the formula for the circumference of a circle?

A. Find the length of the diameter and double this amount. Subtract it from the length of the circumference. Set an equation to show the difference equaling the ratio between a circumference and radius. Then rearrange the equation to solve for the circumference.

B. Find the length of the radius. Then find the circumference. Use the square of the radius to set up an equation showing the relationship that the square of the radius equals the π times circumference. Then rearrange the equation to equal the circumference.

C. Find the length of the radius and the area of the circle. Divide the area by the radius to get a quotient of π . Write an equation showing the area of a circle equals this quotient times the radius. Then substitute the area for 3 times the circumference and rearrange the equation to equal the circumference.

D. Find the length of the diameter and the length of the circumference of the circle. Divide the length of the circumference by the length of the diameter. Set up an equation showing the ratio of the circumference to the diameter equal to π . Then rearrange the equation by solving it for the circumference. Substitute 2 times the radius for the diameter.

A regular polygon inscribed in a circle can be used to derive the formula for the area of a circle. The polygon area can be expressed in terms of the area of a triangle.
Let s be the side length of the polygon,
let r be the hypotenuse of the right triangle,
let h be the height of the triangle, and
let n be the number of sides of the regular polygon.
polygon area = n(1/2*sh)

Which statement is true?

As h increases, the area of the regular polygon approaches the area of the circle.

As s increases, the area of the regular polygon approaches the area of the circle.

As n increases, the area of the regular polygon approaches the area of the circle.

As r increases, the area of the regular polygon approaches the area of the circle. (has picture)

What is the area of a circle whose radius is 5 ft?

5π ft²

10π ft²

20π ft²

25π ft²

The circumference of a circle is 5π cm.

What is the area of the circle?

25π cm²

10π cm²

6.25π cm²

2.5π cm²

Answers

1) Area of a circle = πr^2
Radius = 13.2 ÷ 2
= 6.6
Area = (3.14)(6.6)^2
= 136.78cm^2

I hope this helps!

You see a used car you wish to buy. The dealer quotes you a price of $11,550. You have a blue book quotation of $8,400 for the same model and year. How much markup on cost is the dealer using?

Answers

The dealer is charging $3150 markup

Answer:

37.5%

Step-by-step explanation:

We have been given that the dealer quotes you price of a car $11,550. You have a blue book quotation of $8,400 for the same model and year.

First of all, we will subtract the blue book quotation price from the price quoted by dealer to get the amount of markup.

[tex]\text{Mark-up}=\$11,550-\$8,400[/tex]

[tex]\text{Mark-up}=\$3,150[/tex]

Now, we will find $3,150 is what percent of $8,400.

[tex]\text{Mark-up percent}=\frac{\$3150}{\$8400}\times 100[/tex]

[tex]\text{Mark-up percent}=0.375\times 100[/tex]

[tex]\text{Mark-up percent}=37.5\%[/tex]

Therefore, the dealer is using 37.5% of markup on the cost.

Write the domain of the function given in the graph in set builder notation.

a. {x|x<=10}
b. {x|x<=0}
c. {x|x>10}
d. {x|x>0}

I can't get a picture of the graph so I'll try to explain. Y axis 0-5, going up by 1's, x axis 0-50, going up by 5's. Line starts at 10 on the x axis, goes up at an angle and stops at 40.

Answers

Based on what I understood, the graph would look something like this (attached as a picture). I don't know what angle it would be but I just assumed simple conditions where in the function is linear. From the given graph, the domain (x-values) would start from 10 to 40. Thus x would be equal to or greater than 10. The answer would be C.

The product of a number and 7 is at most the difference of the number and 5. write an inequality and solve for the variable

Answers

the inequality would be: 7n =< n - 5
(subtract n from both sides): -n -n

so then: 6n =< -5
(divide both sides by 6): 6n/6 =< -5/6

answer: n =< -5/6 OR n =< -0.83

Hope this helps :)

I cant seem to figure out this question? someone please help me please

Answers

h is measured in miles so you need to convert 1135ft to miles

1 mile = 5280 feet

so 1135/5280 = 0.21496 miles

D = sqrt(2(3960)(0.21496) + 0.21496^2)

D = sqrt(1702.4832 + 0.046207801)

D = sqrt(1702.529408

D = 41.2617 miles round answer as needed

Which is the best simplification of (24 x 32) / (2 x 3)?

Answers

(24*32)/(2*3)
(768)/(6)
=128
I hope this helped you!!

Final answer:

To simplify (24 x 32) / (2 x 3), perform the multiplication operations first. Then perform the division operation. This results in the simplification of the given expression to 128.

Explanation:

To simplify the expression (24 x 32) / (2 x 3), we'll first carry out the multiplication operations because of the BIDMAS or PEMDAS rule that gives the order of operations in maths. B or P stands for brackets, I or E stands for Indices or Exponents, D/M for Division/Multiplication and A/S for Addition/Subtraction. According to this rule, Division or Multiplication is performed from left to right. Therefore, we first multiply 24 x 32 which gives 768, and secondly multiply 2 x 3 which gives 6. Thus, the expression now becomes 768 / 6. This division gives us the final answer of 128.

Learn more about Mathematical Simplification here:

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Suppose you are building a rectangular pen for your goats. You use 400 feet of fencing for the pen.

Answers

part A

The pen has a rectangular shape of length l and width, say w.

The perimeter (the fencing) of this rectangle is 2l+2w, as in the rectangle we have 2 opposing sides of length l and 2 opposing sides of length w.

This means that 2l+2w=400

subtract 2l from both sides:

2w=400-2l

divide by 2:

w=200-l, so we find that the width is 200-l.

part B

we are asked to find w when l=80 ft,

since we have w=200-l, we can find w for l=80 ft by substituting :

w=200-l=200-80=120 (feet)

Part C

The area of the pen when l=90 feet is:

[tex]A_{pen}=width \cdot length=(200-l) \cdot l=(200-90) \cdot 90\\\\=110 \cdot 90=9,900[/tex] (square feet)

What is 23% of 256? please help

Answers

So first you need to turn the percent into a decimal. So 23% would be 0.23 because you divide 23 by 100 to turn it into a decimal. Now you multiply 0.32 and 256. So:

[tex]0.23 *256=58.88[/tex]

So your answer would be 23% of 256 is 58.88. I hope this helps! =)

At 12 noon in anchorage Alaska Janice noticed that the temperature outside was 12
f. The temperature dropped at a steady rate of 2 F per hour.

Answers

I assume that you want to know the temperature at a certain timing.
Well, you know that at 12:00 pm, the temperature was 12 F and that it decreases by a steady rate of 2 F each hour.

This means that at 1:00 pm, the temperature was 12-2 = 10 F
At 2:00 pm, the temperature was 10-2 = 8 F
At 3:00 pm, it was 8-2 = 6 F
.......and so on

You can follow this sequence to the timing you are looking for.

Are you smart enough to answer this??

Answers

y intercept: -3

Find the slope:
(0,-3)(4,0)

0-(-3)/4-0
3/4

Put into slope intercept form
y=3/4x-3

Because it is shaded above with a dashed line, the sign is >
Final answer: y>3/4x-3

Diana received $35 worth in Starbucks gift cards for Christmas her favorite drink caramel macchiato costs about $4:00 help diana keep track of the balance left in her gift cards each time she buys a drink how many caramel macchiato will she be able to buy with her gift cards?

Answers

35/4=8.75
So she will be able to buy 8 caramel macchiatos.
:)

Diana can buy a total of 8 caramel macchiatos with her $35 Starbucks gift cards, and she will have a remaining balance of $3.

To help Diana keep track of the balance on her Starbucks gift cards after purchasing her favorite drink, the caramel macchiato, we need to perform a series of simple subtractions. She starts with a $35 balance, and each caramel macchiato costs $4.00.

After buying the first caramel macchiato, the new balance is $35 - $4.00 = $31.

After the second purchase, $31 - $4.00 = $27.

This process continues until the balance is less than the cost of a caramel macchiato.

To find out how many drinks she can purchase in total, we divide the initial balance by the cost of one caramel macchiato:

$35 / $4.00 = 8.75

Since she cannot buy a fraction of a drink, Diana can buy a total of 8 caramel macchiatos with her gift cards and will have a remaining balance of $3, which is not enough for another drink.

The scale of a map is 1 in. :500 mile. City A is 650 miles from City B. How far is it's distance on the map?

Answers

Thanks for the question!

650/500 * 1
1.3 * 1
1.3 in

Hope this helps!

A flower store has 42 carnations and 21 pansies. It puts the same number of flowers in each of 7 bouquets.

How many flowers are in each bouquet?

Answers

First you add 42 + 21 and that equals 63

Next you divide 63 by 7 which is nine

So the answer is that there are 9 flowers in each bouquet

42 carnations / 7 bouquets would equal 6 carnations per bouquet
21 pansies / 7 bouquets would be 3 pansies per bouquet

there would be 6 carnations and 3 pansies in each bouquet equaling in 9 flowers per bouquet

Sammie bought just enough fencing to border either a rectangular plot or a square plot, as shown. The perimeters of the plots are the same.How many meters of fencing did she buy?

Answers

perimeter of square : p = 4a.....
p = 4(x + 2)
p = 4x + 8

perimeter of rectangle : p = 2(L + W)
p = 2(3x + 2 + x - 1)
p = 2(4x + 1)
p = 8x + 2

so if the perimeters are te same, lets set them equal to each other and solve for x

4x + 8 = 8x + 2
8 - 2 = 8x - 4x
6 = 4x
6/4 = x
1.5 = x

the square : p = 4x + 8.....p = 4(1.5) + 8.....p = 14 meters
the rectangle : p = 8x + 2....p = 8(1.5) + 2.....p = 14 meters

so she bought 14 meters of fencing <==

Final answer:

The fencing purchased by Sammie corresponds to the perimeter of either a square or rectangular plot. The perimeters of both these shapes are equal. Therefore, the amount of fencing purchased is equivalent to the perimeter calculated using either of these shapes' formulas.

Explanation:

This question is about the concept of perimeter in mathematics. Perimeter is the distance around the border of a shape. In this case, the shapes in question are a square and a rectangle. Because the question states that Sammie has enough fencing for either shape and that the perimeters are the same, we can infer that she bought a length of fencing equivalent to the perimeter of either shape.

Let's take a look at how we calculate perimeter:

For a square, the perimeter (P) is calculated by multiplying the length of one side (s) by 4. So, P = 4s.For a rectangle, the perimeter is calculated by adding twice the width (w) and twice the length (l) of the rectangle. So, P = 2l + 2w.

In this scenario, even without specific numerical information, because the perimeters for both shapes are equal, it means that the fencing purchased would correspond to the same value obtained using either of these formulas.

Learn more about Perimeter here:

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An expression to convert 50 miles per hour to miles per minute is shown.
What value can be entered in the box to correctly make this conversion?

Answers

Use the fact that 1 hour = 60 minutes, from which you can create your conversion factor: 1 = hour / 60 minutes. That permit you to multiply the number of miles per hour times [1 hour/60minutes] to convert 50 miles per hours to miles per minute. This is the calculation: 50 miles/hour * [1hour/60minures] = 0.833 miles / minute

Answer:

x = 60

Step-by-step explanation:

We have to convert 50 miles per hour to miles per minute.

1 hour = 60 minutes

Comparing with the given expression, we get

x = 60

Earl runs 75 meters in 30 seconds. How many meters does Earl run per second?

Answers

divide distance by time

75 /30 = 2.5 meters per second

.25 of a meter. Divide 75 by 30

In which number is the digit 4 one hundred times larger than the value of 4 in the number 41?
A) 435
B) 540
C) 4,350
D) 9,400

Answers

A.435 I'm pretty sure

C, because the digit 4 represents 40 and in answer c the 4 represents 4,000, 40 times 100 is 4,000

Why is the completely factored form X^4+8x^2-9

Answers

Greetings!

This is still factor-able:
[tex]x^4+8x^2-9[/tex]
[tex]x^4+9x^2-x^2-9[/tex]
Factor by grouping.
[tex]x^2(x^2+9)-1(x^2+9)[/tex]
[tex](x^2+9)(x^2-1)[/tex]
Factor by difference in squares.
[tex](x^2+9)(x-1)(x+1)[/tex]

Hope this helps.
-Benjamin

one week, the music store sold 2 trumpets, 3 clarinets, and 5 violins for $1240. the next week, they sold 3 trumpets, 1 clarinet, and 4 violins for $1027. the following week, they sold 5 trumpets, 7 clarinets, and 2 violins for $2091. find the cost of a trumpet, a clarinet would, and a violin.

Answers

One week, the music store sold 2 trumpets, 3 clarinets, and 5 violins for $1240. the next week, they sold 3 trumpets, 1 clarinet, and 4 violins for $1027. the following week, they sold 5 trumpets, 7 clarinets, and 2 violins for $2091.

Let x be the cost of trumpets

y be the cost of clarinets

z be the cost of violins

Now we frame equations

2x +3y + 5z = 1240 ---> equation 1

3x + 1y + 4z = 1027---> equation 2

5x + 7y + 2z = 2091 ---> equation 3

Now we solve for x,y and z using elimination method

Multiply the second equation by -3 and with first equation

2x +3y + 5z = 1240

-9x - 3y -12z = -3081

--------------------------------

-7x - 7z = -1841 ( divide both sides by -7)

x + y = 263 ----------> equation 4

Multiply the second equation by -7 and add it with third equation

-21x - 7y - 28z = -7189

5x + 7y + 2z = 2091

------------------------------------

-16x - 26z = -5098 (divide the whole equation by -2)

8x + 13z = 2549 --------> equation 5

Now use equation 4 and 5 to eliminate x. Multiply equation 4 by 8

-8x - 8z = -2104

8x + 13z = 2549

------------------------------

5z = 445

z = 89

We know x + z = 263, replace z with 89

x + 89 = 263 ( subtract 89 on both sides)

x = 174

2x +3y + 5z = 1240 ---> equation 1 ( substitute the values of x and z)

2(174) + 3y + 5(89) = 1240

348 + 3y + 445 = 1240

793 + 3y = 1240 ( subtract 793 on both sides)

3y = 447 ( divide by 3 on both sides)

y = 149

The cost of trumpets = $174

The cost of clarinets = $149

The cost of violins = $89

Using a system of equations, it is found that:

The cost of a trumpet is of $174.The cost of a clarinet is of $149.The cost of a violin is of $89.

------------------

For the system of equations, i will say that:

The cost of a trumpet is x.The cost of a clarinet is y.The cost of a violin is z.

------------------

2 trumpets, 3 clarinets, and 5 violins for $1240, thus:

[tex]2x + 3y + 5z = 1240[/tex]

3 trumpets, 1 clarinet, and 4 violins for $1027, thus:

[tex]3x + y + 4z = 1027[/tex]

5 trumpets, 7 clarinets, and 2 violins for $2091, thus:

[tex]5x + 7y + 2z = 2091[/tex]

------------------

From the second equation:

[tex]y = 1027 - 3x - 4z[/tex]

Replacing into the other two:

[tex]2x + 3y + 5z = 1240[/tex]

[tex]2x + 3(1027 - 3x - 4z) + 5z = 1240[/tex]

[tex]-7x - 7z = -1841[/tex]

Simplifying by 7:

[tex]x + z = 263 \rightarrow z = 263 - x[/tex]

Also:

[tex]5x + 7y + 2z = 2091[/tex]

[tex]5x + 7(1027 - 3x - 4z) + 2z = 2091[/tex]

[tex]-16x - 26z = -5098[/tex]

[tex]16x + 26z = 5098[/tex]

------------------

Solving for x:

[tex]16x + 26z = 5098[/tex]

[tex]16x + 26(263 - x) = 5098[/tex]

[tex]10x = 1740[/tex]

[tex]x = \frac{1740}{10}[/tex]

[tex]x = 174[/tex]

The cost of a trumpet is of $174.

------------------

Solving for z:

[tex]z = 263 - x = 263 - 174 = 89[/tex]

The cost of a violin is of $89.

------------------

Solving for y:

[tex]y = 1027 - 3x - 4z = 1027 - 3(174) - 4(89) = 149[/tex]

The cost of a clarinet is of $149.

A similar problem is given at https://brainly.com/question/22826010

A scientist measures a substance to be 0.6 grams. Calculate the percent of error in the measurement. Show all work for full credit.

Answers

Percent error is a tool used for determining the precision of your calculations. It is being compared to an accepted value. The calculation of such requires the theoretical or an accepted value without this value, it would be hard to calculate. The formula is expressed as:
% Error = ( |accepted value - measured value| / accepted value ) x 100%

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