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3 years ago

Evaluate f(x)=5x−8 when x=−3,0, and 4 PLS ANSWER FAST :D

Mathematics

1 answer:

Ksju [112]3 years ago

4 0

Answer: -23, -8, 12

Step-by-step explanation:

f(x)=5x−8

When x=−3,

f(-3)=5(-3)−8 = -15-8 = -23

When x=0,

f(0)=5(0)−8 = -8

When x=4,

f(4)=5(4)−8 = 20-8=12

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Simplify by combining like terms. 2(3y − 5) + 8 − 6y

Romashka-Z-Leto [24]

Answer:

-2

Step-by-step explanation:

8 0

4 years ago

Read 2 more answers

Solve for x 0.3x=0.01x+2.9

PolarNik [594]

Answer:

0.3x= 0.01x+2.9 -->

--> -0.01x -0.01x -->

--> 0.29x= 2.9 -->

--> /0.29 /0.29 -->

--> x=10

Step-by-step explanation:

1: subtract 0.01x from both sides

2: divide your answer (0.29) on both sides

3. you answer is now whatever x is (10)

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4 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

4 years ago

What does the expression 0.65d represent ?

Arte-miy333 [17]

It means that there is 0.65 for every D there is.
For example, if it costed $0.65 to pay for each apple, the D would represent the apple and in this case the expression would be 0.65d.
Hope I helped :)

6 0

3 years ago

Please help on this one

VLD [36.1K]

C. 2x√x

HOPE THIS WILL HELP YOU

5 0

3 years ago