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3 years ago

2 Fred and Ted each have a savings account. Fred's savings account is represented in the table below.

Mathematics

1 answer:

maria [59]3 years ago

7 0

Answer:

you have to divide all the numbers and see what it is

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Points D,E,F are non-Collin war.How many lines can be drawn that pass through F and are perpendicular to DE

Arada [10]

Points def are parallel

4 0

4 years ago

Given that the first step of the sequence of transformations that maps ABCD to PQRST is a reflection, identify the the transform

olga55 [171]

Answer:

Step-by-step explanation:

4 0

3 years ago

What is the y - intercept of the equation y = 8x+4?<br> x-1

Tomtit [17]

Answer:

Step-by-step explanation:

y=8x+4

y=mx+b where m=slope and b=y-intercept

b=4

3 0

4 years ago

A group of statistics students decided to conduct a survey at their university to find the average (mean) amount of time student

Butoxors [25]

Answer: $(21.541,\ 23.059)$

Step-by-step explanation:

The confidence interval for population mean is given by :-

$\overline{x}\pm z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}$

Given : Sample size : $n=240$ , which is a large sample , so we apply z-test .

Sample mean : $\overline{x}=22.3$

Standard deviation : $\sigma= 6$

Significance level : $\alpha=1-0.95=0.05$

Critical value : $z_{\alpha/2}=1.960$

Now, a confidence interval at the 95% level of confidence will be :-

$22.3\pm(1.960)\dfrac{6}{\sqrt{240}}\\\\\approx22.3\pm0.759\\\\=(22.3-0.759,\ 22.3+0.759)\\\\=(21.541,\ 23.059)$

7 0

3 years ago

A 45 foot ladders leaning up against a building. The base of the latter is 20 feet away from the building. What is the angle of

Tatiana [17]

Answer:

The angle of elevation to the top of the building is 63.61 degrees

Step-by-step explanation:

Here, we want to calculate angle of elevation to the top of the building.

For this, we need a triangle

Please check for this in the attachment.

From the diagram, we are to calculate the angle theta.

To do this, we use trigonometric identities.

Looking at what we have, we have the hypotenuse and the adjacent.

So the trigonometric identity to use is the cosine

Mathematically Cosine theta = adjacent/hypotenuse

Thus, Cos theta = 20/45

Cos theta = 0.444444444444444

Theta = Arc cos(0.444444444444444)

Theta = 63.61 degrees

8 0

3 years ago