Mathematics High School

O número -3 é a raíz da equação x² - 7x - 2c = 0. Nessas condições, determine o valor do coeficiente c: A) 7 B) -2 C) -3 D) 15 E) NDA

Answers

Answer 1

Responder:

c = 15

Explicação passo a passo:

se -3 é a solução para a expressão x² - 7x - 2c = 0, para obter c, vamos substituir x = -3 na equação (uma vez que é uma raiz)

x² - 7x - 2c = 0

(-3) ² - 7 (-3) - 2c = 0

9 + 21 - 2c = 0

30 - 2c = 0

30 = 2c

Trocar

2c = 30

c = 30/2

c = 15

Portanto, o valor de c é 15

Related Questions

Pls help me solve this question!!!

Find angle x, y, and z​

Answers

Answer:

x=184° z=44° y=24°

Step-by-step explanation:

this is the answer

give me branlist answer

please write the answers with explanation..if nonsense answers I will report.....so answer properly​

Answers

Answer: 86 degree

Step-by-step explanation:

The Straight line is 180 degrees so if we minus 180 by the outward degree there will be the degree for inward degree

P: 95 degrees T: 160 degree S: 88 degrees R: 91 degree

The degree for the pentagon is 540 degrees so If I minus 540 by all the four inward degrees there will be the missing last degree

95 + 160 + 88 + 91 = 434 degree

540 - 434 = 106 degree

180 - 106 = 94 degree

So the last inward degree is 94

Finally, if I minus 180 by 94 (the way I used to find inward degree and to find outward degree for now) it equals 86 degree

so X is 86 degree

Sorry if this was too confusing:)

Answer:

1st--> x=135

2nd-->x=74

Step-by-step explanation:

1st:

triangle =180°

180-90=90

90÷2=45

straight line=180°

180-45=135

therefore x=135°

2nd:

pentagon=540°

straight line=180°

180-92=88 for line s

180-20=160 for line q

180-85=95 for line p

180-89=91 for line r

160+95+88+91=434

540-434=106

180-106=74

therefore x=74°

hope that's okay

Asking again since I still don’t understand

Skylar collects coins and stamps. She wants to organize her collections to display them together. She has 56 coins and 72 stamps,
and she wants the same number of each item in each display.

What is the greatest number of displays Skylar can make?

Enter your answer in the box.

Answers

Answer:

She can only display each item 56 times

Step-by-step explanation:

Since she has 72 stamps and 56 coins to have a even amount of both she can only make 56 displays

Answer: 8

Step-by-step explanation: Solve this problem with GCF (Greatest Common Factor).

Factors of 56: 1, 2, 4, 7, 8, 14, 28 and 56.

Factors of 72: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36 and 72.

So, the biggest among the numbers that are matching is 8.

25 points people please help i will mark brainly give 5 stars and give 5 hearts if correct

Answers

first one: false
second one: false
third one: false
fourth one: true

After my salary was increased by 16%, it was $52,200. What was my salary before the increase?


I'll give brainliest if correct

Answers

The correct answer is $45,000 :)

$45000 was my salary before the increase.

What is percentage?

Percentage can be calculated by dividing the value by the total value, and then multiplying the result by 100.

According to the question

After my salary was increased by 16%, it was $52,200.

Based on the given conditions, formulate

= [tex]\frac{52200}{1+16\%}[/tex]

= [tex]\frac{52200}{1+0.16}[/tex]

= [tex]\frac{52200}{1.16}[/tex]

= [tex]\frac{5220000}{116}[/tex]

= $45000

$45000 was my salary before the increase.

Find out more information about percentage here

https://brainly.com/question/24159063

#SPJ2

Someone help me?Please

Answers

Answer:

C

Step-by-step explanation:

7 5/6 is 7.833333333333333333333

4x=8 99999999999999999999999999999999999999999

Answers

Answer:

x=2

Step-by-step explanation:

Answer:

X =2

Step-by-step explanation:

4X=8

X=8/4

X=2

Find the slope of the line that passes through (6, 10) and (4, 3).

Answers

the slope of the line is m= 7/2

Answer:

7/2

Step-by-step explanation:

1. To find the slope given two points, you can use the formula [tex]\frac{y_2-y_1}{x_2-x_1}[/tex] (by plugging in corresponding values and simplifying) and then find it!

2. (Solving)

[tex]\frac{y_2-y_1}{x_2-x_1}[/tex] [tex]\frac{(3)-(10)}{(4)-(6)}[/tex] [tex]\frac{-7}{-2}[/tex] [tex]\frac{7}{2}[/tex]

Therefore, the slope of the line is 7/2.

i need help plz if any one is willing to help me

Answers

The answer is y = 1/2x+4.

For this all you have to do is add the three on both sides to get it into the form that you are being asked.

Answer:

y=1/2x + 4?

Step-by-step explanation:

I am not really sure. Im sorry if im wrong:(

The recommended weight of an adult male can be approximated by the formula w = 5.5h - 220,
where w is weight in pounds and h is height in inches.

What is the approximate weight of a male that is 68 inches tall?


172 pounds

154 pounds

183 pounds

176 pounds

Answers

Answer:

154 pounds

Step-by-step explanation:

If h=68, then w=5.5(68)-220=374-220=154

154 pounds

5.5(68) - 220= 154

Use the distributive property to write an expression that is equivalent to 8(7+ X).

56+ 8x
8+ 7x
56+ x
7 + X= 1/8


​

Answers

Answer:

56 + 8x

Step-by-step explanation:

8(7) + 8(x)

= 56 + 8x

On a cold day, the temperature in a certain city changed −23.8°F over 6.8 hours. What was the average change in temperature per hour? Enter your answer as a decimal in the box.

Answers

Answer:

-2.5 :3

Degrees Farenheit!

Step-by-step explanation:

k12

hope this helped!

Please give me the crown.

~Happy Helper~

Based on the temperature change and the amount of time it did so, the average change in temperature per hour is -3.5°F.

The average change in temperature per hour can be found by:

= Temperature change / Number of hours

Solving would give:

= -23.8 / 6.8

= -3.5°F

We can therefore conclude that in every hour of this cold day, the temperature changed by an average of -3.5°F.

Find out more at https://brainly.com/question/17569569.

five times the sum of x and y decreased by 2x
write this as an algebraic expression

Answers

[tex]x + y \times 5 - 2x[/tex]This algebraic expression can be formed with the given data.

Answer:

5(x+y) - 2x

this is the algebraic expression

john bought a full basket of mangoes when he got home he realised 12 out of the 20 mangoes he bought are bad what is the probability of the good ones​

Answers

12/20 mangoes are bad so 8/20 mangoes are good and to convert to a percentage we make the denominator 100.
To make 20 to 100 we times by 5 so we do the same to the numerator which is 8
So 8x5 = 40%
Give me brainliest answer plz
And hope it helps!

please answer this question with full explanation​

Answers

The answer is A
Look at the calculator on the working out on the paper

3/6 = n/2

proportional relationships

Answers

Answer:

1.

Step-by-step explanation:

Do cross multiplying, 3 x 2 = 6

6 divided by 6 = 1

n = 1

Answer:

n = 1

Step-by-step explanation:

3/6  = n/2 Find the greatest common factor of the numerator and denominator

1:3/2:3 = n/2 Factor out and cancel the greatest common factor

1/2 = n/2 Swap sides

n/2 = 1/2

help me due tonighttt

Answers

Answer:

X=22° ; Exterior Angle = 125°

Step-by-step explanation:

The exterior angle theorem states that the exterior angle of a triangle is equal to the sum of the two opposite interior angles.

(2x) + (103 - x) = (6x - 7)

103 + 7 = 6x - 2x + x

110 = 5x -->(Divided by 5)--> x=22°

6(22) - 7 = 125°

Find the surface area of this triangular prism. Be sure to include the correct unit in your answer.

Answers

[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪  {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]

The Surface area of the triangular prism is :

[tex] {(13 \times 6) + (5 \times 6) + (12 \times 6) + 2 \times \bigg( \dfrac{1}{2} \times 12 \times 5 \bigg)}[/tex]

[tex]78 + 30 + 72 + 2 (30)[/tex]

[tex]180 + 60[/tex]

[tex]240 \: \: {in}^{2} [/tex]

What is the value of 3p^2 + 8 when p = 4?

Answers

Answer:

56

Step-by-step explanation:

First, copy the given expression. Then replace p with 4. Then evaluate the expression.

3p^2 + 8 =

= 3(4^2) + 8

= 3(16) + 8

= 48 + 8

= 56

it has no picture just these

Answers

Answer:

angle OPN, angle PON, angle NOP, angle PNO

Step-by-step explanation:

Essentially, this simply asks what angles contain the line OP. If we draw the triagnle NOP (in that order starting at the top), we can see that all these angles include the line OP within their angles.

(note: Im not sure if it is asking for the line OP in that order. If so, it would only be angles 1 and 3, as those have OP in that order)

how to solve 125×-1=25×+3​

Answers

Answer:

x=1/25

Step-by-step explanation:

please help me please ​

Answers

Here's the solution in attachment :

A person bought 32 seeds for $16. How many can another person buy if they have $4?

Answers

Answer:

8 seeds

Step-by-step explanation:

16 = 32

4 = ?

16 ÷4 = 4

32 ÷ 4 = 8

Jack had to get three more pails of water than Jill did. The product of the number of
pails they had to get was 40. How many pails of water did Jill have to get?

Answers

Answer:

Impossible?

Step-by-step explanation:

Answer:

5 pails

because jack has 5 pail and he must get 3 more pail to times 5 and get 40

is y= 4x(8 -x) a linear or a nonlinear function?

Answers

Answer:

nonlinear

Step-by-step explanation:

You would do distributive property it’s non linear because there is a squared value while linear functions don’t ever have squared values

(-10,7) and (4,6)
Find the midpoint of the segment with the given endpoints.

Answers

Answer:

(-3,6.5)

Step-by-step explanation:

Find the length of the indicated side in each triangle, to nearest unit.

Answers

Answer:

A= 56

E= 59

Step-by-step explanation:

All triangle are 180 degrees so

A.

71 + 53 = 124

180- 124 = 56

B.

70 + 51 = 121

180 - 121 = 59

Hope this helps

PLEASE HURRY
One number is two less than a second number. Five times the first is 8 more than 2 times the second. Find the numbers
what is the value of the first and second number?

Answers

Answer:

PLEASE MARK BRAINLIEST

Step-by-step explanation:

a+2= b

5a - 8 =2b

a= b- 2

since(a= b- 2)

5(b-2) -8 = 2b

5b -10 - 8 = 2b

3b -18 =0

3b=18;b=6

since b =6

a= 6-2 ; a= 4

Science:
What is the kinetic energy of a 20 kg bowling ball moving in horizontal direction at 5.2 m/s towards the pin?​

Answers

[tex]▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ { \huge \mathfrak{Answer}}▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ [/tex]

Given terms are :

m = mass = 20 kg

v = velocity= 5.2 m/s

let's solve for kinetic energy :

[tex] \dfrac{1}{2} m {v}^{2} [/tex]

[tex] \dfrac{1}{2} \times 20 \times 5.2 \times 5.2[/tex]

[tex]10 \times 5.2 \times 5.2[/tex]

[tex]270.4 \: \: joules[/tex]

Determine if linear or nonlinear

Answers

[tex]▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ { \huge \mathfrak{Answer}}▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ [/tex]

The first graph represents a non - linear function, because rate of change (slope) is not constant.

The second graph represents a linear function since, it has a constant rate of change (slope)

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