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3 years ago

(7^2-5)x2 can someone please help me and do it STEP BY STEP please in the easiest way STEP BY STEP this is algebra 1

Mathematics

1 answer:

tigry1 [53]3 years ago

5 0

Answer:

Step-by-step explanation:

(7² - 5) × 2

(49 - 5) × 2

(42) × 2

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Calculate the unit rate: $19.20 for 6 feet of ribbon

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Answer:

=$3.02

Step-by-step explanation:

$19.20 ÷ 6= $3.02

Hope I helped :))

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3 years ago

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In a group of bird-watchers, 3 out of every 5 people have seen a bald eagle. What percent of the bird-watchers have not seen a

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40% of the group have not seen a bald eagle.

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3 years ago

Can you make a triangle with 5cm, 8cm, 15cm

pshichka [43]

Answer:no because 2 sides of a triangle have to be equal to the other angle or greater than the other angle

Step-by-step explanation:

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2 years ago

In a completely randomized experimental design, three brands of paper towels were tested for their ability to absorb water. Equa

arlik [135]

Answer:

Yes. At this significance level, there is evidence to support the claim that there is a difference in the ability of the brands to absorb water.

Step-by-step explanation:

The question is incomplete:

The significance level is 0.05.

The data is:

Brand X: 91, 100, 88, 89

Brand Y: 99, 96, 94, 99

Brand Z: 83, 88, 89, 76

We have to check if there is a significant difference between the absorbency rating of each brand.

Null hypothesis: all means are equal

$H_0:\mu_x=\mu_y=\mu_z$

Alternative hypothesis: the means are not equal

$H_a: \mu_x\neq\mu_y\neq\mu_z$

We have to apply a one-way ANOVA

We start by calculating the standard deviation for each brand:

$s_x^2=30,\,\,s_y^2=6,\,\,s_z^2=35.33$

Then, we calculate the mean standard error (MSE):

$MSE=(\sum s_i^2)/a=(30+6+35.33)/3=71.33/3=23.78$

Now, we calculate the mean square between (MSB), but we previously have to know the sample means and the mean of the sample means:

$M_x=92,\,\,M_y=97,\,\,M_z=84\\\\M=(92+97+84)/3=91$

The MSB is then:

$s^2=\dfrac{\sum(M_i-M)^2}{N-1}\\\\\\s^2=\dfrac{(92-91)^2+(97-91)^2+(84-91)^2}{3-1}\\\\\\s^2=\dfrac{1+36+49}{2}=\dfrac{86}{2}=43\\\\\\\\MSB=ns^2=4*43=172$

Now we calculate the F statistic as:

$F=MSB/MSE=172/23.78=7.23$

The degrees of freedom of the numerator are:

$dfn=a-1=3-1=2$

The degrees of freedom of the denominator are:

$dfd=N-a=3*4-3=12-3=9$

The P-value of F=7.23, dfn=2 and dfd=9 is:

$P-value=P(F>7.23)=0.01342$

As the P-value (0.013) is smaller than the significance level (0.05), the null hypothesis is rejected.

There is evidence to support the claim that there is a difference in the ability of the brands to absorb water.

3 0

3 years ago

1. Mrs. Rodger got a weekly raise of $145. If she gets paid every other week, write an integer describing how the raise will aff

nasty-shy [4]

Answer:

Increase by $145

Step-by-step explanation:

= $ (x + 145 + 145)

= $ (x + 290)

5 0

3 years ago