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3 years ago

I NEED HELP!!! ASAP!!

Mathematics

1 answer:

Vesnalui [34]3 years ago

8 0

Answer:

Perimeter=24 inches

Area= around 43.46 inches

Step-by-step explanation:

1) Perimeter = 3in * number of sides

Perimeter = 3*8 = 24

Area= 2(1+ square root of 2) length of one side squared

=42.46

Perimeter = 24

Area= 43.46 inches squared- 3inches

Perimeter = 24

Area= 43.46- triangle area

triangle area = height x base /2

Height = 3, we can compare it.

Base = 3

Triangle = 9/2

Area = 43.46- 4.5

Area =38.96

Can't see 4 and 5 for some reason

Perimeter = 30

Area = 61.94

Sorry if its incorrect, I am just 4th grade :(

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An appliance dealer's website features the mean life expectancy values for major household appliances. A standard refrigerator's

marshall27 [118]

Answer:

There is an 84% probability that your standard refrigerator will last between 12 and 20 years.

Step-by-step explanation:

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

A standard refrigerator's mean life expectancy is 18 years with a standard deviation of 2 years. This means that $\mu = 18, \sigma = 2$ .

What is the probability that your standard refrigerator will last between 12 and 20 years?

This probability is the pvalue of Z when $X = 20$ subtracted by the pvalue of Z when $X = 12$ . So

X = 20

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{20 - 18}{2}$

$Z = 1$

$Z = 1$ has a pvalue of 0.8413

X = 12

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{12- 18}{2}$

$Z = -3$

$Z = -3$ has a pvalue of 0.0014

This means that there is a 0.8413-0.0014 = 0.8399 = 0.84 = 84% probability that your standard refrigerator will last between 12 and 20 years.

5 0

3 years ago

Whole proofs page for 50 points (serious answers only or report and 1 star)

lord [1]

The reasons that can be used to complete the two column table used to prove the required expressions are;

1. ∆ABD Cong. ∆CBE Side-Angle-Side, SAS, rule of congruency

2. ∆ABC cong. ∆EDC Angle-Side-Angle, ASA, rule of congruency

<h3>Which postulates can be used to complete the tables?</h3>

1. Statements Reasons

1) <A = <C Given

2) AB = BC. Congruent sides of isosceles triangle

3) AE Cong. DC. Given

4) AE = DC. Definition of congruency

5) ED Cong. ED. Reflexive property of equality

6) AE + ED = DC + ED Addition property of equality

7) AE + ED = AD, DC + ED = CD Addition property of equality

8) AD = ED, Substitution property of equality

9) AD Cong. ED Definition of congruency

10) ∆ABD Cong. ∆CBE Side-Angle-Side, SAS, rule of congruency

2. Statements Reasons

1) AB || DE Given

Midpoint of BD = C Given

2) <ABC Cong. <EDC Alternate angles formed by parallel lines

3) BC Cong. CD Definition of midpoint

4) <ACB Cong. <DCE Vertical angle theory

5) ∆ABC cong. ∆EDC Angle-Side-Angle, ASA, rule of congruency

Learn more about the rules of congruency here:

brainly.com/question/4186813

#SPJ1

3 0

2 years ago

Solve the system of equations below pleasee

sergeinik [125]

Answer:

C. (-7,-2)

Step-by-step explanation:

hope this helps

6 0

3 years ago

What is the product of 1010 and 9\sqrt{72} in simplest radical form?

Bas_tet [7]

Answer:

DirectoryResearch Maniacs

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Square Root of 72 in Simplest Radical Form

Simplest Radical Form

Here we answer "What is the square root of 72 (√72) in simplest radical form?" The square root of 72 in its simplest form means to get the number 72 inside the radical √ as low as possible.

Here is how to do that! First we write the square root of 72 like this:

√72

The largest perfect square of the factors of 72 is 36. We can therefore convert √72 like this:

√36 × 2

Next, we separate the numbers inside the √ as such:

√36 × √2

√36 is a perfect square that equals 6. We can therefore put 6 outside the radical and get the final answer to square root of 72 in simplest radical form as follows:

6√2

3 0

3 years ago

PLEASE HELP IM ON A TIME LIMIT :(

Mice21 [21]

Answer:

hey hope this helps

<h3 /><h3>Comparing sides AB and DE </h3>

AB =

$\sqrt{ {1}^{2} + {1}^{2} }$

$= \sqrt{2}$

$= \sqrt{ {(3 - 5)}^{2} + {(1 + 1}^{2} } \\ = \sqrt{ {( - 2)}^{2} + {(2)}^{2} } \\ = \sqrt{4 + 4} \\ = \sqrt{8} \\ = 2 \sqrt{2}$

So DE = 2 × AB

and since the new triangle formed is similar to the original one, their side ratio will be same for all sides.

<u>scale factor</u> = AB/DE

= 2

It's been reflected across the Y-axis

<em>moved thru the translation of 3 units towards the right of positive x- axis </em>

for this let's compare the location of points B and D

For both the y coordinate is same while the x coordinate of B is 0 and that of D is 3

so the triangle has been shifted by 3 units across the positive x axis

7 0

3 years ago