I got this one wrong please help I don't understand must so work...

You would first substitute x and y into the equation so: -2(-2)^2+4(3)

Then you solve:

-2(-2)^2+4(3)

8+12

so your answer will be 20

The primes in the range 1–38 are ...

... 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37

There are 12 of them, so the probability of drawing a prime is

... 12/38 = 6/19

Answer:

[tex]\text{Probability}=\frac{6}{19}[/tex]      

Step-by-step explanation:

Given : Balls numbered from 1 to 38 are placed in a container and stirred. If one is drawn at random.

To find : The probability that the number is a prime number

Solution :  

Probability is defined by,

[tex]\text{Probability}=\frac{\text{Favorable outcome}}{\text{Total number of outcome}}[/tex]

Favorable outcomes - To get the number is prime number from 1 to 38

Prime numbers are those which were not divisble by any number except 1 and itself.

From 1 to 38 - 2,3,5,7,11,13,17,19,23,29,31,37

Favorable outcome = 12

Total number of outcome is 1 to 38 = 38

[tex]\text{Probability}=\frac{\text{Favorable outcome}}{\text{Total number of outcome}}[/tex]

[tex]\text{Probability}=\frac{12}{38}[/tex]

[tex]\text{Probability}=\frac{6}{19}[/tex]                                          

30

dividing the length and width by 2

10 ÷ 2 = 5 and 12 ÷ 2 = 6

he can plant 5 × 6 = 30 pumpkin plants

daniel will be 32 and his son will be 8

To find the number of boys, you can set up an equation using the given information. Solve the equation to find the number of boys.

To solve this problem, let's define a variable for the number of boys. Let x represent the number of boys.

According to the problem, we know that the amount of boys is 3 times the number of boys, minus 2. So the expression for the number of boys is 3x - 2.

We also know that the total number of people is 26. Therefore, we can set up an equation: 3x - 2 + x = 26.

By combining like terms and solving the equation, we can find the number of boys. The solution is x = 7. Therefore, there are 7 boys.

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9514 1404 393

Answer:

  25% increase

Step-by-step explanation:

A percentage change is calculated using the formula ...

  percent change = ((new value) - (old value))/(old value) × 100%

  = (500 -400)/400 × 100%

  = 100/400 × 100%

  = 25%

A positive percentage change indicates an increase.

The change from 400 to 500 is a 25% increase.

You want to get y by itself

y=1/2 x

y=mx+b

m=1/2 b=0

y = [tex]\frac{1}{2}[/tex] x + 0

given 2y = x ( divide both sides by 2 )

y = [tex]\frac{1}{2}[/tex] x + 0

Answer:

6i\sqrt{19}

Step-by-step explanation:

Write and solve an inequality:

Total(t) = $5.42 + ($1.08/therm)(t) ≤ $87.50.

First, subtract $5.42 from $87.50:  then ($1.08/therm)(t) ≤ $82.08

Next, divide both sides by $1.08 per therm:

t ≤ ($82.08) / ($1.08/therm) = 76 therms (maximum).  Thus, Rameen's usage could be [0,76] (therms).

Answer:

[0,76]

Step-by-step explanation:

Step 1. Read the problem.

Step 2. Identify what you are looking for.

the number of therms Rameen can buy

Step 3. Name what you are looking for. Choose a variable to represent that quantity.

Let t= the number of therms.

Step 4. Translate. Write a sentence that gives the information to find it. Translate into an inequality.

$5.42 plus $1.08 times the number of therms is less than or equal to $87.50.

5.42+1.08t≤87.50

Step 5. Solve the inequality.

1.08tt≤82.08≤76

Step 6. Check the answer in the problem and make sure it makes sense.

Yes, 5.42+1.08(76)=87.50.

Step 7. Answer the question with a complete sentence.

Rameen can buy no more than 76 therms if he wants his heating bill to be a maximum of $87.50.

Since it is not possible to buy a negative number of therms, the lest number of therms Rameen can buy is 0.

In interval notation, the amount of therms Rameen can buy is [0,76].

c. (0, 3), (4, -1)

for (0,3): 3 = -0 + 3  good

for (4,-1): -1 = -4 + 3  good

(c)

Substitute the x-coordinate from each point into the equation and if equal to the corresponding y- coordinate then the point lies on the line

(a)

x = - 1 : y = 1 + 3 = 4 ≠ - 2

x = 1 : y = - 1 + 3 = 2 ≠ 4

(b)

x = 1 : y = 2 = 2

x = 0 : y = 0 + 3 = 3 ≠ - 3

(c)

x = 0 : y = 3 = 3 ← correct

x = 4 : y = - 4 + 3 = - 1 = - 1 ← correct

the pair of points is (c)

Answer:

The last quiz score must be at least an 80 to get the average to be a 70.

Step-by-step explanation:

In order to find this, you need to take the average of the 4 test scores along with the unknown test score (x). So, to find an average, we add all the numbers together and divide by the amount of tests taken. We can then set this equal to 70 since that is the minimum average.

(60 + 64 + 75 + 71 + x)/5 = 70 ------> Multiply both sides by 5

(60 + 64 + 75 + 71 + x) = 350 -----> Combine like terms

270 + x = 350 -----> Subtract 270 from both sides

x = 80

Answer:

2 1/10

Step-by-step explanation:

(5 1/4)/(2 1/2)

Change mixed fraction to improper fractions

(21/4)/(2 1/2)

(21/4)/(5/2) =21/10

=2 1/10

Answer:

2 1/10

Step-by-step explanation:

Solution:

Given equation of line [tex]-4x+2y=24[/tex]

To find the x-intercept of the equation, substitute [tex]y=0[/tex] in the equation,

[tex]\Rightarrow -4x+2(0)=24\\\Rightarrow -4x=24\\\Rightarrow x=-\frac{24}{4} =-6[/tex]

Hence,  x-intercept of the equation is [tex](-6,0)[/tex].

To find the y-intercept of the equation, substitute [tex]x=0[/tex] in the equation,

[tex]\Rightarrow -4(0)+2y=24\\\Rightarrow 2y=24\\\Rightarrow y=\frac{24}{2} =12[/tex]

Hence,  y-intercept of the equation is [tex](0,12)[/tex].

Answer:

Total gallons of fresh water in the tank [tex]3.1926*10^3[/tex] gallons.

Step-by-step explanation:

Percentage of fresh water = [tex]100%-6.1%[/tex]

                                            =93.9%

Total number of gallons of water in tank = [tex]3.4*10^3[/tex]   (given in the question)

Therefore,

Total gallons of fresh water in the tank   =  [tex]3.4*10^3*93.9/100[/tex]

                                                                  =[tex]3.1926*10^3[/tex] gallons.

Your identity says ...

... sum of cubes = (sum)³ -3(product)(sum)

... = 4³ -3·1·4

... = 64 -12 = 52

_____

The two numbers are 2±√3, and the sum of their cubes is indeed 52.

Mrs. Riley can make 168 pillows because she bought 168.75 yards of fabric and each pillow requires 1 yard of fabric.

First, we need to determine how many yards of fabric Mrs. Riley purchased. We do this by dividing the total cost of the fabric ($405) by the cost per yard ($2.40). So, 405 ÷ 2.4 = 168.75 yards. Each pillow requires 1 yard of fabric, therefore she can sew 168 pillows with no leftover fabric.

Here is the calculation in more detail:

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if im not mastaken the answer is -48

Answer:

1) Volume of water displaced = 5.16 L

2) Copper sinks in water.

Explanation:

1)  Density of copper = 8.92[tex]g/cm^3[/tex]

 Mass of copper = 46 kg = 46000 g

 We know that, Density = Mass / volume

        So, Volume = Mass/ density

              Volume of copper = 46000/8.92 = 5156.95 [tex]cm^3[/tex]

  Since the density of copper 8.92[tex]g/cm^3[/tex] is greater than density of water 1[tex]g/cm^3[/tex], the copper immerses in water. Since it immerses it will displace a volume of water which is equal to the volume of copper.

  So volume of water displaced = volume of copper = 5156.95 [tex]cm^3[/tex] =5.16 L of water

2)  Since the density of copper 8.92[tex]g/cm^3[/tex] is greater than density of water 1[tex]g/cm^3[/tex], the copper immerses in water.  So copper sink in water.

let h= history books

science books = s

h=2s  there are 2 times as many history as science so to get them equal we double the science

h+s=81    there are 81 total history and science books

2s+s=81   substitute 2s for h in the above equation

3s = 81   combine like terms

s = 27

There are 27 science books

h=2s

h=2(27)

h=54

there are 54 history books

The price of the small pots is $2.40 so you would have 2.4s ( multiply the number of small pots by the price)

She bought a total of 14 pots, so the number of large pots would be 14 - s ( subtract the number of small pots from the total )

Now you have:

L = 14-s

2.4s + 5.6(14-s) = 49.6

The answer is C.

Answer:

[tex]1098[/tex] square feet of glass is needed to replace the window.

Step-by-step explanation:

Square feet is the unit of measure of Area.  How many square feet of glass are required to replace the window can be found by calculating the area of the window.

Area of the window = Width * Length

=[tex]\frac{122}{3}*\frac{81}{3}[/tex]

=[tex]\frac{122*81}{3*3}[/tex]

=[tex]\frac{9882}{9}[/tex]

=[tex]1098[/tex] square feet.

∴ we need [tex]1098[/tex] square feet of glass.

1098 ft²

Area = width × height

         = [tex]\frac{122}{3}[/tex] × [tex]\frac{81}{3}[/tex]

        = [tex]\frac{122(81)}{3(3)}[/tex] = [tex]\frac{9882}{9}[/tex]= 1098 ft²

[tex]|\Omega|=12^2=144\\|A|=4\cdot3=12\\\\P(A)=\dfrac{12}{144}=\dfrac{1}{12}[/tex]

Answer:

Step-by-step explanation:

Givens

m<T = 120

m<C = 30

PC = 4

Find PC

Solution

4/sin(30) = PC / sin(120)         Note: this is the sine law.

Multiply both sides by sin(120)

[tex]\dfrac{4*sin(120)}{sin(30)} = \text{PC}[/tex]

4*0.866/0.5 = PC

Answer

PC= 6.928

The equation of the circle in standard form with a center at (2, -3) and a radius [tex]\(4\sqrt{5}\)[/tex] is [tex]\( (x - 2)^2 + (y + 3)^2 = 80 \)[/tex].

To find the equation of the circle with the diameter endpoints given,

The midpoint of a segment with endpoints (x1, y1) and (x2, y2) is given by the formula:

Midpoint [tex]\((M_x, M_y)[/tex] = [tex]\left(\frac{x1 + x2}{2}, \frac{y1 + y2}{2}\right)\)[/tex]

For the endpoints A (-2,-5) and B (6,-1), we calculate:

[tex]\(M_x = \frac{-2 + 6}{2} = \frac{4}{2} = 2\)[/tex]
[tex]\(M_y = \frac{-5 + (-1)}{2} = \frac{-6}{2} = -3\)[/tex]

So, the midpoint, which is the center of the circle, is C (2, -3).

The radius is half the length of the diameter, and the length of the diameter is the distance between the endpoints A and B using the distance formula:

Distance d = [tex]\sqrt{(x2 - x1)^2 + (y2 - y1)^2} \)[/tex]

r = [tex]\frac{d}{2} = \frac{\sqrt{(6 - (-2))^2 + (-1 - (-5))^2}}{2} \)[/tex]

Calculating the expressions:

r = [tex]\frac{\sqrt{(6 + 2)^2 + (-1 + 5)^2}}{2} \)[/tex]
 = [tex]\frac{\sqrt{8^2 + 4^2}}{2} \)[/tex]
 = [tex]\frac{\sqrt{64 + 16}}{2} \)[/tex]
 = [tex]\frac{\sqrt{80}}{2} \)[/tex]
 = [tex]\frac{8\sqrt{5}}{2} \)[/tex]

r = [tex]4\sqrt{5} \)[/tex]

The equation of a circle with center (h, k) and radius r can be represented as:
[tex]\( (x - h)^2 + (y - k)^2 = r^2 \)[/tex]

Plugging our midpoint as the center and our radius into the equation:

[tex]\( (x - 2)^2 + (y + 3)^2 = (4\sqrt{5})^2 \)[/tex]

Simplifying,
[tex]\( (x - 2)^2 + (y + 3)^2 = 16 \cdot 5 \)[/tex]
[tex]\( (x - 2)^2 + (y + 3)^2 = 80 \)[/tex]

Thus, the required equation is [tex]\( (x - 2)^2 + (y + 3)^2 = 80[/tex].

Answer:

Option C is right answer

Step-by-step explanation:

We have in coordinate geometry a straight line in slope intercept form as

y = mx+c

where m is the slope and c is the y intercept

There are special lines when m=0 and m = infinity.

When a line is parallel to y axis, it has slope = tan90 = infinity.

Hence line will have equation of the form x = a for some a.

Since the line passes through (3,2) we can find a using this.

Substitute x value to get 3 = x

Hence equation of the line is x =3

Answer:

X=3

Step-by-step explanation:

- 9 ≤ x ≤ 7

the domain is the values of x on the x- axis that define y = f(x)

y is defined for all values of x in the stated domain

Answer:

1 3/5

Step-by-step explanation:

4/15÷1/6

Copy dot flip

4/15 * 6/1

24/15

Divide the top and bottom by 3

8/5

Change the improper fraction to a mixed number

5 goes into 8 1 time with 3 left over

1 3/5

The two short sides must be longer than those required in an isosceles right triangle. The ratio of side length to hypotenuse length in a 45°-45°-90° triangle is 1 : √2. So, such a triangle requires side lengths of 30/√2 ≈ 21.213 inches. Its perimeter will be about

... (30 +21.213 +21.213) in = 72.426 in

Since the perimeter needs to be slightly longer than that for the triangle to be acute, the smallest possible perimeter is ...

... 72.43 in

ONE solution was found, 1.5