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2 years ago

Help a friend who is horrible at algebra pls :^)

Mathematics

1 answer:

sergij07 [2.7K]2 years ago

3 0

Find the vertex by using the formula -b/2a
To find a and b, we must know that a and b are located at y = ax^2 + bx + c.
We find that b is 4 and a is 1 by looking at the given quadratic function.
The answer is A. -4/2(1) because the question is looking for the correct steps to find the answer.

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Please help this is worth a lot of my grade:(

Ede4ka [16]

Answer:

Step-by-step explanation:

$a_n=-3n+50\\ \\ a_{15}=-3(15)+50\\ \\ a_{15}=-45+50\\ \\ a_{15}=5$

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2 years ago

Will mark brainliest, please answer:)

yanalaym [24]

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3 years ago

If it takes 6 hours for a plane to travel 720km with a tail wind and 8 hours to make the return trip with a head wind. Find the

denis-greek [22]

The speed of wind and plane are 105 kmph and 15 kmph respectively.

<u>Solution:</u>

Given, it takes 6 hours for a plane to travel 720 km with a tail wind and 8 hours to make the return trip with a head wind.

We have to find the air speed of the plane and speed of the wind.

Now, let the speed wind be "a" and speed of aeroplane be "b"

And, we know that, distance = speed x time.

$\text { Now, at tail wind } \rightarrow 720=(a+b) \times 6 \rightarrow a+b=\frac{720}{6} \rightarrow a+b=120 \rightarrow(1)$

Now at head wind → $720=(a-b) \times 8 \rightarrow a-b=\frac{720}{8} \rightarrow a-b=90 \rightarrow(2)$

So, solve (1) and (2) by addition

2a = 210

a = 105

substitute a value in (1) ⇒ 105 + b = 120

⇒ b = 120 – 105 ⇒ b = 15.

Here, relative speed of plane during tail wind is 120 kmph and during head wind is 90 kmph.

Hence, speed of wind and plane are 105 kmph and 15 kmph respectively.

6 0

3 years ago

The point (0,9) is rotated 90° clockwise about the point (0,0) what are the coordinates of the transformed point?

EleoNora [17]

(-9,0) is the answer of the new cordinates

4 0

2 years ago

Find the value of "m" that gives infinitely many solutions ! PLEASE HELP!!

Gre4nikov [31]

Answer: 2x

Step-by-step explanation: 18+2(x-7)=4+M. First distribute 2 to (x-7), then you will be left with 18+2x-14=4+M. You can further simplify the left side of the equation by subtracting 14 from 18, now you are left with 2x+4=4+M. Subtract 4 from both sides to solve for M, 2x=M.

5 0

3 years ago

Read 2 more answers