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3 years ago

helpppp me pleassse its one tiny easy little question I give brainliest !!! ^^ I would really appreciate it <3

Mathematics

1 answer:

irina [24]3 years ago

5 0

Answer:

where's the question?

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∠C and ∠D are complementary.

Brut [27]

Answer:

x = 8

Step-by-step explanation:

The sum of the measures of two complementary angles is 90°.

m<C + m<D = 90°

5x + 7x - 6 = 90

12x = 96

x = 8

5 0

2 years ago

Could someone help me rnnn?

GuDViN [60]

Answer:

vertex = (0, -4)

equation of the parabola: $y=3x^2-4$

Step-by-step explanation:

Given:

y-intercept of parabola: -4
parabola passes through points: (-2, 8) and (1, -1)

Vertex form of a parabola: $y=a(x-h)^2+k$

(where (h, k) is the vertex and $a$ is some constant)

Substitute point (0, -4) into the equation:

$\begin{aligned}\textsf{At}\:(0,-4) \implies a(0-h)^2+k &=-4\\ah^2+k &=-4\end{aligned}$

Substitute point (-2, 8) and $ah^2+k=-4$ into the equation:

$\begin{aligned}\textsf{At}\:(-2,8) \implies a(-2-h)^2+k &=8\\a(4+4h+h^2)+k &=8\\4a+4ah+ah^2+k &=8\\\implies 4a+4ah-4&=8\\4a(1+h)&=12\\a(1+h)&=3\end{aligned}$

Substitute point (1, -1) and $ah^2+k=-4$ into the equation:

$\begin{aligned}\textsf{At}\:(1.-1) \implies a(1-h)^2+k &=-1\\a(1-2h+h^2)+k &=-1\\a-2ah+ah^2+k &=-1\\\implies a-2ah-4&=-1\\a(1-2h)&=3\end{aligned}$

Equate to find h:

$\begin{aligned}\implies a(1+h) &=a(1-2h)\\1+h &=1-2h\\3h &=0\\h &=0\end{aligned}$

Substitute found value of h into one of the equations to find a:

$\begin{aligned}\implies a(1+0) &=3\\a &=3\end{aligned}$

Substitute found values of h and a to find k:

$\begin{aligned}\implies ah^2+k&=-4\\(3)(0)^2+k &=-4\\k &=-4\end{aligned}$

Therefore, the equation of the parabola in vertex form is:

$\implies y=3(x-0)^2-4=3x^2-4$

So the vertex of the parabola is (0, -4)

5 0

3 years ago

Read 2 more answers

Which correctly uses bar notation to represent the repeating decimal for 6/11

Gelneren [198K]

Hello!!

Grab a calculator and calculate 6/11. You'll get 0.54545454545454, which can be written as 0.54 with a bar over the 54.

Hope this helps!! Let me know if you have ANY questions.

5 0

3 years ago

Please help asap I wasn’t here for this so I don’t know

sammy [17]

Answer:

First 25% 10 - 22.5

Next 25% 22.5 - 35

Third 25% 35 - 47.5

Last 25% 47.5 - 60

Step-by-step explanation:

First get the median of the entire data.

From the median, you split the data into two and find the median for both sections.

Finally, your smallest median is your first 25% and so on.

7 0

3 years ago

No link need right answer 100 points

maks197457 [2]

Answer:

13 1/8

Step-by-step explanation:

3/2* 7/2*5/2

= 105/8

= 13 1/8

8 0

3 years ago