value of the discriminant for the equation -3x=-x^2+2x

Radhika attempted 8 questions incorrectly, while Mohini attempted 13 questions incorrectly.

The given parameters are:

Correct = +3

Wrong = -2

Let the correct attempt be x and the incorrect attempt be y.

The equation that represents the total score is:

Total = 3x - 2y

She scored a total of 20.

So, we have:

3x - 2y = 20

She got 12 correctly.

So, we have:

3 * 12 - 2y = 20

Evaluate the product

36 - 2y = 20

Subtract 36 from both sides

-2y = -16

Divide by -2

y = 8

Hence, Radhika attempted 8 questions incorrectly.

In (a), we have the equation that represents the total score is:

Total = 3x - 2y

She scored a total of -5

So, we have:

3x - 2y = -5

She got 7 correctly.

So, we have:

3 * 7 - 2y = -5

Evaluate the product

21 - 2y = -5

Subtract 21 from both sides

-2y = -26

Divide by -2

y = 13

Hence, Mohini attempted 13 questions incorrectly.

Read more about linear equations at:

https://brainly.com/question/14323743

#SPJ1

Answer:

a) 1/2, b) = - sqrt(3) / 2

Step-by-step explanation:

a) Let A = 120 degree, B = 180 degree

Using cosine sum is cos(120+180) = cos(120)*cos(180) - sin(120)* sin(180)

which will give you 1/2

b) Let A = 360, B = 60 degree

Using sine difference: sin(360-60) = sin(360) cos(60) - cos(360) sin (60)

gives you -sqrt(3)/2

Cos (300°) using the cosine sum identity is 1/2.

sin (300°) using the sine difference identity is √3/2.

Trigonometric ratios are the ratios which is described for two sides of a right angled triangle.

The main three trigonometric ratios are sine, cosine and tangent functions.

Part A :

The cosine sum identity is,

cos (A + B) = cos (A) cos (B) - sin (A) sin (B)

We can write cos (300°) as,

cos (300°) = cos (180° + 120°)

                  = cos (180°) cos (120°) - sin (180°) sin (120°)

sin (180°) = 0 and cos (180°) = -1

So,  cos (300°) = -cos (120°) = -(-1/2) = 1/2

Part B :

Sine difference identity is,

Sin (A - B) = sin (A) cos (B) - cos(A) sin (B)

We can write sin (300°) as,

sin (300°) = sin (360° - 60°)

                = sin (360°) cos(60°) - cos(360°) sin (60°)

                = - sin (60°)

                = -√3 / 2

Hence the value of Cos (300°) using the cosine sum identity is 1/2 and the sin (300°) using the sine difference identity is √3/2.

Learn more about Trigonometric Ratios here :

https://brainly.com/question/29081149

#SPJ2

Answer:

2

Step-by-step explanation:

Answer: 2,111 soccer balls

Step-by-step explanation:

         We will divide the total amount of money by the price per ball to find how many balls the league can buy.

        $6,333 / $3 = 2,111

        The league can buy 2,111 soccer balls.

Answer:

O The value of f(2) is smaller than the value of f(1).

Step-by-step explanation:

First, let's solve for both. When the problem says f(1) or f(2), this just means that the x value is equal to that. So:
f(1) = -5(1)^2 + 2(1) + 9 = 6
f(2) = -5(2)^2 + 2(2) + 9 = -7
Since f(1) = 6 and f(2) = -7, we know that f(1) is greater than f(2). Therefore, the value of f(2) is smaller than the value of f(1)

Step-by-step explanation:

the missing side is given by sqrt(16² - 8²)

hence,

the number that belongs in the green box is 192

Answer:$249895.46

Step-by-step explanation:

Well, if 2250 dollars increase by 17% every year for 30 years, then it will be 2250*(1.17)^30

which would be $249895.46

so if you could increase money by 17% every year, 2250 dollars now will be worth a lot in 30 years!

Answer:

The answer should be D.

On the basis of least variation from the expected value is:

   Sample A ⇒ Sample D ⇒ Sample B ⇒ Sample C

Variance is the expectation of the squared deviation of a random variable from its population mean or sample mean.

Here, on the basis of least variation,

we had arranged the given sample as per their expected value.

Thus, On the basis of least variation from the expected value is:

   Sample A ⇒ Sample D ⇒ Sample B ⇒ Sample C

Learn more about Variance from:

https://brainly.com/question/16269880

#SPJ1

Fish fed during night  is equal to  1/6 tons

Let the weight of the fish fed at night = X tons

In the morning, the weight of the fish fed Wm = 2/15 tons.

In the afternoon, 1/15 ton more fish fed during the morning.

∴ Weight of fish fed in afternoon Wa

= 2/15 + 1/15

= 3/15 tons

Given that,

Wm + Wa + Wn = 1/2 tons

∴ 2/15 + 3/15 + Wn = 1/2

∴Wn = 1/2 - 5/15

∴ Wn = 3/6 - 2/6

∴ Wn = 1/6 tons

Fish fed during night = 1/6 tons.

To learn more about the weight visit:

https://brainly.com/question/2337612

#SPJ1

[tex]\text{L.H.S}\\\\=1+ \cos^4 x - \sin^4 x\\\\=1+ (\cos^2 x)^2 - (\sin^2 x)^2\\\\=1+(\cos^2 x + \sin^2 x)(\cos^2 x- \sin^2 x)\\\\=1+1\cdot(\cos 2x)\\\\=1+\cos 2x\\\\=2\cos^2 x\\\\=\text{R.H.S}\\\\\text{Proved.}[/tex]

Answer:

19i

Step-by-step explanation:

note that [tex]\sqrt{-1}[/tex] = i

[tex]\sqrt{-361}[/tex]

= [tex]\sqrt{361(-1)}[/tex]

= [tex]\sqrt{361}[/tex] × [tex]\sqrt{-1}[/tex]

= 19 × i

= 19i

Considering the given function, the ordered pair (5,8) means that the signed up for 5 weeks of yoga classes and 8 weeks of kickboxing classes.

The function that represents the relationship between the number x of yoga classes that Donovan signs up for and the number y of kickboxing classes is given by:

8x + 12y = 136.

Hence the ordered pair (5,8) means that the signed up for 5 weeks of yoga classes and 8 weeks of kickboxing classes.

More can be learned about functions at https://brainly.com/question/25537936

#SPJ1

Answer:

Architects use geometry to study and divide space as well as draft detailed building plans. Builders and engineers rely on geometric principles to create structures safely. Designers apply geometry (along with color and scale) to make the aesthetically pleasing spaces inside. Applying geometry in design is unavoidable.

The sample of 800 consumers, 230 took coffee, 245 took tea and 325 took cocoa are shown in the picture by the Venn diagram.

It is defined as the diagram that shows a logical relation between sets.

The Venn diagram consists of circles to show the logical relation.

We have:

From a sample of 800 consumers, 230 took coffee, 245 took tea and 325 took cocoa, 30 took all the three beverages, 70 took coffee and cocoa, 110 took coffee only, and 185 took cocoon only.

We can represent the above data by the Venn diagram as shown in the picture.

From the Venn diagram:

The number of customers who took none of the beverages

= 800 - 580 = 220

The number of customers who took tea only = 95

The number of customers who took tea and cocoa only = 70

The number of customers who took tea and coffee only = 50

The number of customers who took none of the beverages = 220

Thus, in the sample of 800 consumers, 230 took coffee, 245 took tea and 325 took cocoa are shown in the picture by the Venn diagram.

Learn more about the Venn diagram here:

brainly.com/question/1024798

#SPJ1

Answer:

Step-by-step explanation:

Harry buys a ream of computer paper priced at $9.99 before a 6.0%

sales tax. He uses a coupon at checkout for a 10% discount. After the

purchase he mails in a form

Answer : 11 and 13

Step-by-step explanation:

Let the numbers be X and Y then,

By question

X= Y - 2 .....................(i)

2Y = 3X - 7 ...............(ii)

putting the value of X from (i) on equation (ii) we get,

2Y = 3(Y - 2) - 7

2Y = 3Y - 6 - 7

2Y - 3y = - 13

-Y = - 13

Y = 13

now putting value of Y in equation (i)

X = 13 - 2= 11

hence those numbers are 11 and 13 respectively

Answer:

I think it's 35x^2 +16x-24 listen I'm not sure yet I could be wrong

The line of the best fit is shown in the picture which is approximate near the dots.

A mathematical notion called the line of the best fit connects points spread throughout a graph. It's a type of linear regression that uses scatter data to figure out the best way to define the dots' relationship.

The slope and y-intercept can be found using the formula below:

[tex]\rm m = \dfrac{n\sum xy-\sum x \sum y}{n\sum x^2 - (\sum x)^2} \\\\\rm c = \dfrac{\sum y -m \sum x}{n}[/tex]

We have a given a scatter plot shows the data for NCAA quarterbacks comparing their attempted passes to completed passes.

We can draw a line of best fit y = mx + c

Thus, the line of the best fit is shown in the picture which is approximate near the dots.

Learn more about the line of best fit here:

brainly.com/question/14279419

#SPJ1

Answer:

a = 4

b = 7

c = 0

4n² + 7n = 0

4/4n² + 7n/4 = 0/4

= n² + 7/4n = 0

a = 1

b = 7/4

c = 0

b = 7/4

(b/2)² = (7/4 ÷ 2)²

Use fraction rule.

7/4 ÷ 2² = 7/4² / 2²

square the numbers

7/4² / 2² = 49/16 ÷ 4

49/16 ÷ 4 = 49/16 × 1/4

49/16 × 1/4 = 49/64

Add to both sides of the equation using 49/64

b = 7/4

b/2 = 7/4 ÷ 2

simplify

b/2 = 7 ÷ (4 × 2)

simplify(arithmetic)

b/2 = 7/8

n² + 7/4n + 49/64 = 49/64

(n + 7/8)² = 49/64

[tex](n+\frac{7}{8})^2=\frac{49}{64}\\\sqrt{(n+\frac{7}{8})^2}=\sqrt{\frac{49}{64}}\\[/tex]

Next, cancel out the square on the left side.

[tex]n+\frac{7}{8}=+/-\sqrt{\frac{49}{64}}[/tex]

Subtract 7/8 from both of the sides.

[tex]n+\frac{7}{8}-\frac{7}{8}=-\frac{7}{8}+/-\sqrt{\frac{49}{64}}[/tex]

Simplify the left side.

[tex]n=-\frac{7}{8}+/-\sqrt{\frac{49}{64}}\\n=-\frac{7}{8}+/-\frac{\sqrt{49}}{\sqrt{64}}\\n=-\frac{7}{8}+/-\frac{7}{8}\\n_1=0\\n_2=-\frac{7}{4}[/tex]

That wraps it up for this equation. Hope it helped!

The average value of f over the region D is 243/4

To answer the question, we need to know what the average value of a function is

The average value of a function f(x) over an interval [a,b] is given by

[tex]\frac{1}{b - a} \int\limits^b_a {f(x)} \, dx[/tex]

Now, given that we require the average value of f(x,y) = 3xy over the region D where D is the triangle with vertices (0, 0), (1, 0), and (1, 9).

x is intergrated from x = 0 to 1 and the interval is [0,1] and y is integrated from y = 0 to y = 9

So, [tex]\frac{1}{b - a} \int\limits^b_a {f(x,y)} \, dA = \frac{1}{1 - 0} \int\limits^1_0 \int\limits^9_0 {3xy} \, dxdy \\= \frac{3}{1} \int\limits^1_0 {x} \,dx\int\limits^9_0 {y} \,dy\\ = \frac{3}{1} [\frac{x^{2} }{2} ]^{1}_{0}[\frac{y^{2} }{2} ]^{9}_{0} \\= 3[\frac{1^{2} }{2} - \frac{0^{2}}{2} ] [\frac{9^{2} }{2} - \frac{0^{2}}{2} ] \\= 3[\frac{1}{2} - 0 ][\frac{81}{2} - 0 ]\\= \frac{81}{2} X3 X \frac{1}{2} \\= \frac{243}{4}[/tex]

So, the average value of f over the region D is 243/4

Learn more about average value of a function here:

https://brainly.com/question/15870615

#SPJ1

Step-by-step explanation:

quarter circle means that you just find the are and then divide it by 4.

hence,

(3.14 × 8²) ÷ 4 = answer

the answer is 50.24 cm²

hope this helps.

Answer: 6.28

Step-by-step explanation: In order to get your answer, the equation that you need to do is 8 X 3.14 / 4 to get your answer.

A coterminal angle of θ such that 0 ≤ θ ≤ 2π is equal to 7π/4 and the exact value of Sin(θ) = -1/√2.

A coterminal angle can be defined as an angle that share the terminal side of an angle which occupies the standard position i.e it has the same initial side.

In this scenario, all angles that are multiples of 2π and added to the given angle (-9π/4) would be coterminal. For the range [0, 2π], 8π should be added to the given angle as follows:

Coterminal angle = -9π/4 + 4π

Coterminal angle = -9π/4 + 16π/4

Coterminal angle = 7π/4.

The reference angle is given by:

7π/4 -π = 3π/4.

Therefore, the exact values of all six (6) trigonometric functions evaluated at θ are:

Read more on coterminal angles here: https://brainly.com/question/23093580

#SPJ1

The functions that are one to one are the set of ordered pairs.

It should be noted that the set of ordered pairs simply means an object that the pairs are significant.

On the other hand, a mapping diagram simply consists of two parallel columns that represents the domain and the range.

In this case, the functions that are one to one are the set of ordered pairs.

Learn more about ordered pairs on:

brainly.com/question/1208726

#SPJ1

Answer:

See below

Step-by-step explanation:

If the whole rectangle were shaded (all 25 parts) that would be 100%

So, we can set up a proportion.

25 = 100%

11 = x

Then, cross-multiply to get,

25x = 1100

Divide both sides by 25 to solve for x

x = 44.

The x value represents the percentage shaded.

44%

Answer:

−5(x+2)=−4x−12−x+2

Step-by-step explanation:

1) −5(x+2)=−4x−12−x+2

−5x−10=−4−10−x

-5x= -5x

0=0

so, it is true for all values

Reason:

Vertical angles are equal to each other. Call them x. They must add to 180 degrees because they are supplementary (they are able to form a straight line).

x+x = 180

2x = 180

x = 180/2

x = 90

Answer:

320 cents per pound

Step-by-step explanation:

so we do 9.60 divided by 3, which is 3.20. So, 3.20 for each pound. Now we need in cents. 3 dollars is 300 cents, plus another 20, so 320 cents. I hope this helped.