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2 years ago

Heheh ik im annoying but plssss im trying to graduate hs

Mathematics

1 answer:

zlopas [31]2 years ago

4 0

Answer:

It's the 2nd one : -30 $a^{5}$ b + 12 $a^{4} b^{3}$ + 16 $a^{3} b^{2}$ - 4 $a^{2} b^{4}$ - 2a $b^{3}$

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Convert the decimal to a fraction in simplest form. 0.25 =

Yuliya22 [10]

The answer in simplest form is 1/4.

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2 years ago

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Solve vertex form out О=x^2 -4x -12

pochemuha

Answer: (2,-16)

Step-by-step explanation: you have to rewrite it by using the vertex form (h,k)

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2 years ago

Habib wants to cover a kitchen wall in ceramic tile. The wall is 42 feet by 10 feet.

Slav-nsk [51]

Answer: Side of largest square tile will be 105 feet.

Explanation:

Since we have given that

dimensions of the wall is 42 feet by 10 feet

So,

Length of wall = 42 feet

Breadth of wall = 10 feet

First we calculate the H.C.F. of 42 and 10,

which is 2 only.

The largest square tile side would be 2 feet.

Now, we find the number of tiles used,

Number of tiles =

$\frac{\text{Area of wall}}{\text{H.C.F. of }42\text{ and }11\times\text{ H.C.F. of }42\text{ and } 11}}\\\\=\frac{42\times 10}{2\times 2}\\\\=\frac{420}{4}\\\\=105$

We get integer value of number of tiles.

Therefore, Side of largest square tile will be 2 feet.

7 0

2 years ago

Y=4x+25 find the domain of the function and if it discrete

lozanna [386]

Answer:

f(x)=xf(x)=x , g(x)=2xg(x)=2x

f(x)=5f(x)=5 , g(x)=xg(x)=x

Step-by-step explanation:

not sure but still,

5 0

2 years ago

Teacl Smolts are young salmon at a stage when their skin becomes covered with silvery scales and they start to migrate from fres

erma4kov [3.2K]

Answer:

a) s = 8.81

b) Q1 = 43.4, Q2 = 49.4, Q3 = 57.35

c) See below

Step-by-step explanation:

(a) Find the standard deviation of the reflectance for these smolts. (Round your answer to two decimal places.)

In order to find the standard deviation, we need the mean first. The mean is defined as

$\bar x=\displaystyle\frac{\displaystyle\sum_{i=1}^{n}x_i}{n}$

where the $x_i$ are the values of the data collected and n=50 the size of the sample.

So, the mean is

$\bar x=50.882$

Now, the standard deviation of the sample is defined as

$s=\sqrt{\displaystyle\frac{\displaystyle\sum_{i=1}^n(x_i-\bar x)^2}{n-1}}$

and we have that our standard deviation is

s = 8.81

(b) Find the quartiles of the reflectance for these smolts

To find the quartiles, we must sort the data from lowest to largest:

33.6, 37.7, 38.3, 38.7, 42, 42, 42.2, 42.4, 42.7, 42.8, 42.9, 43.1, 43.7, 43.8, 44.2, 44.6, 45.5, 45.7, 46.3, 46.6, 47.4, 47.6, 47.7, 47.9, 49.2, 49.6, 50.5, 50.9, 51.3, 53, 53.9, 54.8, 54.9, 55.5, 56, 56, 56.2, 57.1, 57.6, 58.3, 59, 59.5, 60.4, 63.2, 63.4, 63.5, 64.6, 68, 69.1, 69.2

The first quartile is the number between the 12th and the 13th data (so 25% of the data are below it and 75% above it)

So the 1st quartile is

$Q_1=\displaystyle\frac{43.1+43.7}{2}=43.4$

The 2nd quartile is the median, the point between the 25th and 26th data, it splits the data in two halves.

$Q_2=\displaystyle\frac{49.2+49.6}{2}=49.4$

The 3rd quartile is the point between the 38th and 39th data (so 75% of the data are below it and 25% above it)

$Q_3=\displaystyle\frac{57.1+57.6}{2}=57.35$

(c) Do you prefer the standard deviation or the quartiles as a measure of spread for these data? Give reasons for your preference.

In this case, we prefer the quartiles as a measure of spread since the data are very scattered around the mean and there is no a central tendency.

3 0

2 years ago