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4 years ago

Hi may you please help me with this problem thank you?

Mathematics

2 answers:

spin [16.1K]4 years ago

6 0

Answer:

d 86

Step-by-step explanation:

Lubov Fominskaja [6]4 years ago

6 0

86 is you answer otherwise d

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Systems of equations. What are the two solutions with work? y=x^2-5x-4 y=-2x

N76 [4]

Y = x² - 5x - 4
y = -2x

-2x = x² - 5x - 4
+ 5x + 5x 
 3x = x² - 4
 0 = x² - 3x - 4
 0 = x² - 4x + x - 4
 0 = (x + 1)(x - 4)
 0 = x + 1 or 0 = x - 4
 - 1 - 1 + 4 + 4
 -1 = x 4 = x

3 0

3 years ago

Need help with this problem.

tigry1 [53]

Answer:

C) $-\frac{47}{49}$

Step-by-step explanation:

By the cos double angle formula, we know $\cos(2\theta)=2\cos^2\theta-1.$ Substituting $\cos \theta$ into the formula, we get

$\cos(2\theta)=2(-\frac{1}{7})^2-1\\~~~~~~~~~~=\frac{2}{49}-1\\~~~~~~~~~~=\boxed{-\frac{47}{49}}$ .

The answer is C.

5 0

2 years ago

How many models of 100 do you need to model 3200

Andrei [34K]

32 it's 3200 divided by 100

3 0

3 years ago

Read 2 more answers

Find the vertices and foci of the hyperbola with equation quantity x minus 5 squared divided by 144 minus the quantity of y minu

Serjik [45]

$\bf \textit{hyperbolas, horizontal traverse axis } \\\\ \cfrac{(x- h)^2}{ a^2}-\cfrac{(y- k)^2}{ b^2}=1 \qquad \begin{cases} center\ ( h, k)\\ vertices\ ( h\pm a, k)\\ c=\textit{distance from}\\ \qquad \textit{center to foci}\\ \qquad \sqrt{ a ^2 + b ^2} \end{cases}\\\\ -------------------------------$

$\bf \cfrac{(x-5)^2}{144}-\cfrac{(y-4)^2}{81}=1\implies \cfrac{(x-5)^2}{12^2}-\cfrac{(y-4)^2}{9^2}=1 \\\\\\ \begin{cases} h=5\\ k=4\\ a=12\\ b=9 \end{cases}\implies c=\sqrt{144+81}\implies c=\sqrt{225}\implies c=15 \\\\\\ \stackrel{center}{(5,4)}\qquad \qquad \stackrel{\textit{because is a horizontal traverse hyperbola}}{\stackrel{foci}{\stackrel{(5\pm 15,4)}{(20,4),(-10,4)}}\qquad \qquad \stackrel{vertices}{\stackrel{(5\pm 12,4)}{(17,4),(-7,4)}}}$

5 0

3 years ago

Twenty-five subtracted from ½ a number is 10. What is the number?

stira [4]

Answer:

The number is 30.

Step-by-step explanation:

The number = x

25 - 1/2(x) = 10

Mutliply both sides by 2, because you does not want the fraction

50 - x = 20

Now, you have no more fraction. Just move 50 to the right side and change its sign

-x = 20-50

-x = -30

Change its sign

x = 30

So, the number is 30.

Hope it helps!

8 0

3 years ago