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3 years ago

Marking brainliest! If you were to build a rollercoaster, what would you name it and why?

Mathematics

1 answer:

Murljashka [212]3 years ago

7 0

Answer:

mango because you go around the roller coater thats shaped as a mango and it smells like mangos

Step-by-step explanation:

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What is the confidence interval estimate of the population mean percentage change in the price per share of stock during the fir

I am Lyosha [343]

Answer:

(-0.1059 ; - 0.0337)

Step-by-step explanation:

The data table is attached in the picture below:

These is a matched pair design ; which requires taking the difference of the two values for each sample :

The mean and standard deviation of the difference will be used to construct the confidence interval :

The mean of difference, dbar = Σx/n = - 0.0698

The standard deviation of difference, Sd ;

Sd = [√Σ(d - dbar)²/(n-1)] = 0.1054

n = sample size = 25

The confidence interval :

dbar ± [TCritical * Sd/√n]

Tcritical at 90% ; df = n -1 = 25 -1

Tcritical(90% , 24) = 1.1711

C.I = - 0.0698 ± (1.711 * 0.1054/√25)

C.I = - 0.0698 ± 0.0361

C.I = (-0.1059 ; - 0.0337)

5 0

3 years ago

A rocket is launched from a tower. The height of the rocket, why in feet is related to the time after launch, X and seconds, by

Maru [420]

Given:

Consider the height of the rocket, in feet after x seconds of launch is

$y=-16x^2+152x+74$

To find:

The time at which the rocket will reach its max, to the nearest 100th of a second.

Solution:

We have,

$y=-16x^2+152x+74$

It is a quadratic polynomial with negative leading coefficient. So, it is a downward parabola.

Vertex of a downward parabola is the point of maxima.

To find the time at which the rocket will reach its max, we need to find the x-coordinate of the vertex.

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

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

Here, $a=-16,b=152,c=74$ .

So,

$-\dfrac{b}{2a}=-\dfrac{152}{2(-16)}$

$-\dfrac{b}{2a}=-\dfrac{152}{-32}$

$-\dfrac{b}{2a}=4.75$

So, x-coordinate of the vertex is 4.75.

Therefore, the rocket will reach its max at 4.75 second.

8 0

3 years ago

How to find 4 times (-5)

vfiekz [6]

Answer: -20

Step-by-step explanation: Using the same expression except positive numbers, 4 x 5 = 20.

In this case, we can use this equation to find the product for the expression

4 x -5.

If 4 x 5 = 20, then 4 times -5 will also equal 20. However, since there is a negative factor in this expression, our answer will be negative causing our answer to be -20.

6 0

4 years ago

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What is the missing length? 7 cm р area 56 cm? HURRY

r-ruslan [8.4K]

Answer:

Step-by-step explanation:

5 0

3 years ago

Wangari plants trees at a constant rate of 1212 trees every 33 hours. Write an equation that relates pp, the number of trees Wan

igor_vitrenko [27]

Answer:

$p=4h$

Step-by-step explanation:

Let p be the number of trees Wangari plants, and h be the time she spends planting them in hours.

We have been given that Wangari plants trees at a constant rate of 12 trees every 3 hours.

Let us find number of trees planted in 1 hour by dividing 12 by 3.

$\text{Number of trees planted in 1 hour}=\frac{12\text{ plants}}{3\text{ hour}}$

$\text{Number of trees planted in 1 hour}=4\frac{\text{ plants}}{\text{ hour}}$

We can represent this information as: $p=4h$

Therefore, the equation $p=4h$ relates the number of trees (p) Wangari plants, and the time (h) she spends planting them in hours.

3 0

4 years ago

Read 2 more answers