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Charra [1.4K]
3 years ago
14

I do not understand this problem PLEASE HELP

Mathematics
1 answer:
PolarNik [594]3 years ago
8 0
Okay, so this question is asking you about a graph (h(t)=-t^2+4t). Because of the -t^2 this will be a parabola that opens downwards. h(t)=-t^2+4t, you can find that the graph will start at zero (since there is no starting value). The easiest way for you to solve this would be if you had a graphing calculator, if you don't then just use an online graphing website. This is a quadratic problem, so they are constructed as AT^2+BT+C, in this problem A=-1,B=4,C=0. To find the vertex, do -(B/2A), which will give you the X value (T value in this case) of the vertex, then you plug that into your graphing toll, and that gives you the vertex. To find the average rate of change between t=2.5 and t=3, you need to find their Y values. Then you find the difference between those values, and multiply it by two, (since their space is 0.5), and that is your AROC (average rate of change). This means that this is the approximated change rate for the graph since it is inconsistent. Hope this helps explain :D
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4 0
3 years ago
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Plz help I will mark brainliest if correct ​
Alekssandra [29.7K]

Answer:

A ................................

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What is the simplified form of <br><br> (X/3-y/4)/(x/4+y/3) ? (6 points)
Fofino [41]

Option 2: \frac{4x-3y}{3x+4y} is the right answer

Step-by-step explanation:

Given fraction is:

\frac{\frac{x}{3}-\frac{y}{4}}{\frac{x}{4}+\frac{y}{3}}

To solve the fraction, Taking LCM in denominator and numerator

=\frac{\frac{4x-3y}{12} }{\frac{3x+4y}{12}}

When the numerator and denominator both have fractions, the simplified form is obtained be multiplying the numerator with reciprocal of the denominator. So,

= \frac{4x-3y}{12} * \frac{12}{3x+4y}\\=\frac{4x-3y}{3x+4y}

Hence,

Option 2: \frac{4x-3y}{3x+4y} is the right answer

Keywords: fractions, simplification

Learn more about fractions at:

  • brainly.com/question/4401748
  • brainly.com/question/4459688

#LearnwithBrainly

4 0
3 years ago
Give the properties for the equation -2x 2 - y + 10x - 7 = 0.
Sladkaya [172]

Given:

The quadratic equation is

-2x^2-y+10x-7=0

To find:

The vertex of the given quadratic equation.

Solution:

If a quadratic function is f(x)=ax^2+bx+c, then

Vertex=\left(\dfrac{-b}{2a},f(\dfrac{-b}{2a})\right)

We have,

-2x^2-y+10x-7=0

It can be written as

-2x^2+10x-7=y

y=-2x^2+10x-7           ...(i)

Here, a=-2,b=10,c=-7.

\dfrac{-b}{2a}=\dfrac{-10}{2(-2)}

\dfrac{-b}{2a}=\dfrac{-10}{-4}

\dfrac{-b}{2a}=\dfrac{5}{2}

Putting x=\dfrac{5}{2} in (i), we get

y=-2(\dfrac{5}{2})^2+10(\dfrac{5}{2})-7

y=-2(\dfrac{25}{4})+\dfrac{50}{2}-7

y=\dfrac{-50}{4}+25-7

y=\dfrac{-25}{2}+18

On further simplification, we get

y=\dfrac{-25+36}{2}

y=\dfrac{11}{2}

So, the vertex of the given quadratic equation is \left(\dfrac{5}{2},\dfrac{11}{2}\right).

Therefore, the correct option is A.

3 0
3 years ago
A jar contains 18 gold coins, 36 rose gold coins, 9 silver coins, and 27 copper coins. What is the probability of randomly selec
nignag [31]
The answer 63% I worked it out
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