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Andru [333]
3 years ago
5

Can someone help me please!!​

Mathematics
2 answers:
Lynna [10]3 years ago
8 0

Answer:

b because the value are correct

Step-by-step explanation:

Vladimir [108]3 years ago
4 0

Answer:

Yes I can. So I will.

Step-by-step explanation:

Anytime you found yourself in doubt and danger about equations, you can use Geogebra Graph Calc - search for it -, and he will show you the graphic.

But, as I know that you are one the <em>LAST HEROES IN EARTH,</em> I pretty sure you don't want to just surrender yourself for a computer machine.

Let's calculate it:

4x² - 39x + 77

Bháskara Formula, you probably know her as <em>Resolutive Formula</em>, as she is known in my country, is:

BF=\frac{-b \sqrt[]{b^2 - 4ac} }{2a} there is also two signals + - betwen -b and the root.

She's one of the best ways to find roots for quadratic equations.

We will need to do that to find the interval required.

Also, remember that a generic quadratic equation can be describe as:

ax² + bx + c

So, knowing that in this equation

a = 4 / b = -39 / c = 77

We can proceed.

x' = - (-39) + \sqrt[]{(-39)^2 - 4.4.77}/ 2.4

x' = 39 + 17/ 8

x' = 7

x'' = 39 -17/8

x'' = 2,75

Now, you should know that when A > 0 the quadratic equation has her concavity facing down.

As we have the values of the roots, 7 and 2,75, we know that betwen them the equation has negative values.

That also means that all values higher than 7 and lower than 2,75 give to us a positive value.

Final answer:

x<2,75 and x>7

You will see in annex the graphic.

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24% of students buy there lunch, 190 students bring their lunch from home. How many students are there in total
miv72 [106K]

so we know that 24% of the students buy their lunch at the cafeteria, and 190 students brownbag.

well, 100% - 24% = 76%, so the remainder of the students, the one that is not part of the 24% is 76%, and we know that's 190 of them.

since 190 is 76%, how much is the 24%?


\bf \begin{array}{ccll} amount&\%\\ \cline{1-2} 190&76\\ x&24 \end{array}\implies \cfrac{190}{x}=\cfrac{76}{24}\implies 4560=76x \\\\\\ \cfrac{4560}{76}=x\implies 60=x \\\\[-0.35em] ~\dotfill\\\\ \stackrel{\textit{total amount of students}}{190+60\implies 250}

6 0
3 years ago
Read 2 more answers
During a football game a concession stand sold a family three hamburgers and two hotdogs for a total of $13 it's sold another fa
guajiro [1.7K]

Answer:

The price of each hamburger is $3

The price of each hot dogs is $2  .

Step-by-step explanation:

Given as :

The total price of 3 hamburger and 2 hot dogs = $13

The total price of 2 hamburger and 5 hot dogs = $16

Let The price of each hamburger = $x

Let The price of each hot dogs = $y

<u>Now, According to question</u>

3 x + 2 y = 13              .........A

2 x + 5 y = 16              .......B

Now, Solving to eq A and B

3 × (2 x + 5 y ) - 2 × (3 x + 2 y ) = 3 × 16 - 2 × 13

Or, (6 x + 15 y) - (6 x + 4 y) = 48 - 26

Or, (6 x - 6 x) + (15 y - 4 y) = 22

Or, 0 + 11 y = 22

∴  y = \dfrac{22}{11}

i.e y = $2

so, The price of each hot dogs = y = $2

<u>Now, Put the value of y into eq B</u>

i.e 2 x + 5 y = 16

or, 2 x + 5 × 2 = 16

or, 2 x = 16 - 10

or, 2 x = 6

∴  x = \dfrac{6}{2}

i.e x = $3

So, The price of each hamburger = x = $3

Hence, The price of each hamburger is $3 and  The price of each hot dogs is $2  . Answer

3 0
3 years ago
Please help i’m so confused
Viktor [21]

Answer:−x+6

x

Step-by-step explanation:

8 0
2 years ago
Which expression is equivalent to 10k+17-7j-18-11k?
balu736 [363]

Answer:

B. -7j-k-1

Step-by-step explanation:

Simplify:

1. IDENTIFY LIKE TERMS

<em>10k</em>+17-7j-18-<em>11k</em>

  • <em>10k and -11k are like terms since they have the same variable.</em>
  • 17 and -18 are like terms since they are regular numbers.
  • -7j has no like terms.

2. COMBINE LIKE TERMS

-7j-<em>k</em>-1

3 0
3 years ago
Read 2 more answers
I am having trouble with this problem....
Alexeev081 [22]

There 2 angles are corresponding angles, in which the angle measurements would have the same degree.

Set the two angles equal to each other, and solve for x.

7x - 1 = 8x - 14

Isolate the x. Subtract 8x from both sides, and add 1 to both sides

7x (-8x) - 1 (+1) = -14 (+1)

7x - 8x = -14 + 1

-x = -13

Isolate the x. Divide -1 from both sides

(-x)/-1 = (-13)/-1

x = -13/-1

x = 13

13 is your answer for x.

~

4 0
3 years ago
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