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

4(b-2)-10=2(b+3)
B=
PLEASE HELP ME!!!! Show work too

Answers

Answer:

B = 12

Step-by-step explanation:

Give Brainllest plz

I'll give you the brainiest if your answer is right.

Answers

Answer:

=54

Step-by-step explanation:

give me the brainiest

Answer:

ACD would equal 117 degrees.  ACB would equal 63 degrees.

please help 5 stars if ya answer

Answers

Answer:

d. 2.0

Step-by-step explanation:

i hope this helps :)

Answer:

D

Step-by-step explanation:

√2π / √5 (expand the expression)

√2π / √5  x  √5 / √5 (multiply the fractions)

√2π√5 / √5/√5 (calculate and multiply)

solution is √10π/5 so 1.98 round it to the nearest 10 and it'll be 2 so the answer is D

Sometimes, Cindy's little brother interrupts her during homework time. So, she made a triangular "Do Not Disturb" sign to hang on her bedroom door. The base of the sign is 1 1 2 feet long, and the sign is 2 2 3 feet tall. Which equation can you use to find the area of the sign, A?

Answers

Answer:

A = 1/2(b×h)

Step-by-step explanation:

Area = 1/2(base×height)

You and your friend each have a canvas of the same size. You divide your canvas into 5 sections and paint 3 of them. Your friend divides her canvas into 7 sections and paints 4 of them. Who paints more?

Answers

The one one paints 3/5, you would find a common denominator and it would be 21/35 and 20/35 so “you”

The person who paints more is given by the inequality equation 3/5 >  4/7

What is an Inequality Equation?

Inequalities are the mathematical expressions in which both sides are not equal. In inequality, unlike in equations, we compare two values. The equal sign in between is replaced by less than (or less than or equal to), greater than (or greater than or equal to), or not equal to sign.

In an inequality, the two expressions are not necessarily equal which is indicated by the symbols: >, <, ≤ or ≥.

Given data ,

Let the inequality equation be represented as A

Now , the value of A is

Substituting the values in the equation , we get

Let the number of canvas be 35 ( LCM of 5 and 7 )

Now , when you divide 35 into 5 sections and paints 3 of them ,

The fraction A = 3/5

And , when your friend divide 35 into 7 sections and paints 4 of them

The fraction B = 4/7

And , the inequality equation is A > B

Substituting the values in the equation , we get

3/5 > 4/7

Hence , the one who paints more is you with 3/5 of the canvas

To learn more about inequality equations click :

https://brainly.com/question/11897796

#SPJ2

please help asap!
find x .

10
8
12
10.5

Answers

Answer:

꒰ 10.5 ꒱

Step-by-step explanation:

↣ hope this helps! (๑•ᴗ•๑)

~evita  ི⋮ ྀ

Please help if you know the answer please

Answers

Answer: C

The 4 parts he painted represents 4/6 and the one part he painted represents 1/6

ASAP HELP NEEDED, TAKING A TEST

Question: Based on the data set above for the hours per day sixth graders spend using an electronic device, what is the mean number of hours sixth graders use an electronic device?
No links, useless words, or anything like that. I will report you.

Answers

Answer:

Step-by-step explanation:

The mean is the average of the numbers. It is easy to calculate: add up all the numbers, then divide by how many numbers there are. In other words it is the sum divided by the count.

1+1+1+1+2+3=9

2+4+4+5+6+6+7+8+8=50

50/9=5.55555555556

or

9/50=0.18

Pls help me I’m stuck rn in

Answers

Answer:

Rhombus

Step-by-step explanation:

A rhombus is basically just stretched out

Answer:

square or rhombus

Step-by-step explanation:

one of the two

Help please due in 5 minutes

Answers

Answer:

A

Step-by-step explanation:

I think it might be A or C, A most likely

hiroshi earns $6.50 an hour. He wants to buy a cd player that costs $117. Write an equation and find how many hours hiroshi will have to work to buy the cd player.

Answers

I think it’s 6.50x=117
After you solve, you should get 18 hours

Pls answer quickly I need this is ten min

Answers

Answer:

65

Step-by-step explanation:

taht is the answer, 65

HELP FAST PLSS I WILL GUVE BRAINLYEST

Answers

The answers are
1. -12
2. 1
3. -14

Answer for brainliest no files

Answers

Answer:

Step-by-step explanation:

B

Answer:

D. Mia drives 2 miles per day more than Joseph

Step-by-step explanation:

Joseph drives 227.5 miles in 5 days

So, his unit rate = 227.5/5= 45.5 miles per day

Mia drives 332,5 miles in 7 days

So, her unit rate = 332.5/7= 47.5 miles per day

Difference =47.5 - 45.5 = 2 miles per day

So,

Mia drives 2 miles per day more than Joseph.

Write the equation of the line in slope intercept form that passes through the point (4,7) and is parallel to y = -7x + 8.​

Answers

Answer:

y= -7x + 35

Step-by-step explanation:

(y - 7) = -7(x - 4)

y-7 = -7x + 28

y = -7x + 35

What is the volume of a hemisphere with a
radius of 26.7 m, rounded to the nearest tenth of
a cubic meter?

Answers

Answer : 39,865.1m^3

https://brainly.com/question/16146539

Answer:

39881.1m^3

Step-by-step explanation:

v=2/3pir^32/3×22/7×26.7^3837503.17÷21=39881.103m^3answer is 39881.1 since the hundredths value is less than 5

*simplify 5|-3+(-7)|=

Answers

Answer:

-2l -3

Step-by-step explanation:

5l -3+ (-7)l

5l -3 -7l

5l -7l -3

-2l -3

x ^ 2 + y ^ 2 = 34. x + y = 2 . please help me out​

Answers

Answer:

-5,-3 and 3,5

Step-by-step explanation:

2. Which expression is equivalent to (7r - 10)5
e) (5 ⦁ 7r) - (5 ⦁ 10)
f) (5 ⦁ 10) - (5 ⦁ 7r)
g) (5 ⦁ 7r) + (5 ⦁ 10)
h) 5 ⦁ 17r

Answers

E. (5 * 7r) - (5 * 10)

Solve the equation by graphing. x^2-7x+12=0

Answers

Answer:

the answer is GH mm djmwshdnsnda

For a biology assignment, Karen records the height of a plant over time. The
plant was 12 cm tall when she started the assignment. She notices that the
plant grows 6 cm every week.

Which point is on her graph?


A. (36, 4)

B.(3, 24)


C.(3, 32)

D.(1, 12)

Answers

Answer:

The answer is (4,36)

Step-by-step explanation:

Not sure if you have A switched around but it is 4,36.

Answer:

on the final exam its 2,24

Step-by-step explanation:

I completely forgot how to do this, so if you can answer and give an explanation, I’d really appreciate it!

Answers

Answer:

C

Step-by-step explanation:

Well to do this we can eliminate answers that seem unreasonable and just calculate the ones we think might be it

We know it can't be the first one or the second since its perimeter isn't 32

It could be the third one so we can check the perimeter

3+3+16+16=38

so it is the third one

lthe farmer hgjhbjurd​

Answers

Answer:

hey have a good day lol

Step-by-step explanation:

Brainliest please! and thanks btw

Can someone help me please​

Answers

Answer:

the answer to this question is 4.4

Answer:

4.4

Step-by-step explanation:

We will use Pythagorean Theorem to find the remaining side.

Since the hypothenuse (10) is already found, we will do this a little more unconventionally.

9²+x²=10²

x Represents the missing side.

81+x²+100

x²=19

x≈ 4.4

3z+4 z=5 help please?​

Answers

Answer:

z=19

Step-by-step explanation:

3(5)=15

15+4=19

Mark me Brainliest?

Answer: z = 5/7

Step-by-step explanation:

42 - 35 = 8 - 12 + t
What does t mean?

Answers

I think t = 11:
42 - 35 = 8 - 12 + t
7 = 8 - 12 + t
7 = -4 + t
7 + 4 = t
11 = t

Im sorry if this is wrong

A ______ is a comparison of two quantities. ratios can be a part-to-part,part-to- _______, or whole -to- __________ comparisons. ratios can be written with the word _____, with a _______, or as a ___________.​

Answers

Answer:

ratio

part-to-whole

whole-to-whole

with the word to

with a colon

or as a fraction

Step-by-step explanation:

Can u solve this please? Pythagorean theorem

Answers

Answer:

12.8 ft or exactly sqrt 164

Step-by-step explanation:

Pythagoreans is a^2+b^2=c^2

10^2+8^2=164

sqrt 164 = 12.8 ft

Two angles are supplementary. One angle is 25°. What is the measure of the other angle?

Answers

Answer:

The other angle is 155°.

Step-by-step explanation:

Supplementary angles are two angles that have a sum of 180°.

I found my answer my subtracting 25 from 180 (180-25) and my difference was 155.

And, 155 + 25 = 180°.

Therefore, the other angle is 155°.

Find the volume of the irregular
figure.
1 cm
2 cm
? ]cm3
8 cm
1 cm
3 cm
3 cm
5 cm
What is the answer to the question

Answers

3cm

Step-by-step explanation:

mmm I'm trying to help sorry if it didn't helped

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