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Brut [27]
2 years ago
11

Really NEED help PLEASE EXPLAIN!!

Mathematics
1 answer:
Leviafan [203]2 years ago
5 0

Answer:

Lines y = -x+4 and y= 3x+3 intersect the y-axis

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(2a^2-5)+(3a^2-6a+3)​
Ne4ueva [31]

Answer:

5a^2-6a-2

^^^^

6 0
3 years ago
Find cos(2*ABC) 100POINTS
juin [17]

Answer:

-\dfrac{7}{25}

Step-by-step explanation:

<u>Trigonometric Identities</u>

\cos(A \pm B)=\cos A \cos B \mp \sin A \sin B

<u>Trigonometric ratios</u>

\sf \sin(\theta)=\dfrac{O}{H}\quad\cos(\theta)=\dfrac{A}{H}\quad\tan(\theta)=\dfrac{O}{A}

where:

  • \theta is the angle
  • O is the side opposite the angle
  • A is the side adjacent the angle
  • H is the hypotenuse (the side opposite the right angle)

Using the trig ratio formulas for cosine and sine:

  • \cos(\angle ABC)=\dfrac{3}{5}
  • \sin(\angle ABC)=\dfrac{4}{5}

Therefore, using the trig identities and ratios:

\begin{aligned}\implies \cos(2 \cdot \angle ABC) & = \cos(\angle ABC + \angle ABC)\\\\& = \cos (\angle ABC) \cos (\angle ABC) - \sin(\angle ABC) \sin (\angle ABC)\\\\& = \cos^2(\angle ABC)-\sin^2(\angle ABC)\\\\& = \left(\dfrac{3}{5}\right)^2-\left(\dfrac{4}{5}\right)^2\\\\& = \dfrac{3^2}{5^2}-\dfrac{4^2}{5^2}\\\\& = \dfrac{9}{25}-\dfrac{16}{25}\\\\& = \dfrac{9-16}{25}\\\\& = -\dfrac{7}{25} \end{aligned}

7 0
2 years ago
Read 2 more answers
What is 3839 divided by 283
garik1379 [7]
The answer to your question would be 13.565 or rounded to hundreds would be 13.57
3 0
3 years ago
Read 2 more answers
When Debbie babysits she charges 5$ to go to the house plus 8$ for every hour she is the true expression 5+8h gives the amount s
VladimirAG [237]

Answer:45$


Step-by-step explanation:5 + 8(5)

5 + 40= 45


7 0
2 years ago
There are 15 non fiction books and 37 fiction books in the teacher’s collection. Which of the following expresses the ratio of f
anyanavicka [17]
The ratio is 37:15
For every 37 fiction books there are 15 non fiction books
37/15. = 2 7/15
3 0
3 years ago
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