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2 years ago

11

Can someone help me with this question plssssssss brainly

1 answer:

Elan Coil [88]2 years ago

6 0

Answer:

C) -x²+9x²-27+27

<em><u>Hope</u></em><em><u> </u></em><em><u>it </u></em><em><u>helps</u></em>

:)

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What is the slope of the line that contains the points (-1,-1) and (3, 15)?

DanielleElmas [232]

Answer:

its b

Step-by-step explanation:

7 0

3 years ago

A car travels 2.5 hours in a northerly Direction for 300 KM. what is the speed and velocity

STatiana [176]

Speed is distance traveled per block of time. As an equation, this is
Speed = distance/time

In your problem, the given distance is 300km, and the time is 2.5 hours.
Plugging into the equation,
Speed = 300km / 2.5 h
Speed = 120 km/h

Velocity is speed <em>and</em> direction.
The velocity would be 120 km/h north.

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3 years ago

If Mike gets paid $200 per week plus $5 per hour for every hour he works while Mark

NeTakaya

Answer:

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3 years ago

A noted psychic was tested for extrasensory perception. The psychic was presented with 2 0 0 cards face down and asked to determ

Natasha2012 [34]

Answer:

C. P- value < 0.04 0.05

Step-by-step explanation:

hello,

we were given the sample size, n = 200

also the probability that the psychic correctly identifies the symbol on the 200 card is

$p=\frac{50}{200}= 0.25$

using the large sample Z- statistic, we have

$Z=\frac{p- 0.20}{\sqrt{0.2(1-0.2)/200} }$

= $\frac{0.25-0.20}{\sqrt{0.16/200}}$

= 1.7678

thus the P - value for the hypothesis test is P(Z > 1.7678) = 0.039.

from the above, we conclude that the P- value < 0.04, 0.05

3 0

4 years ago

A researcher is planning to compare the effects of two different types of lights on the growth of bean plants. She expects that

kicyunya [14]

Answer:

The sample size is $n = 36$

Step-by-step explanation:

From the question we are told that

The sample standard deviation is $s = 1.5$

The mean difference of the two groups is $\=x _ 1 - \=x_2 = 1$

The standard error is $SE = \frac{ \= x_1 - \= x_2}{4}$

=> $SE = \frac{1}{4}$

Let assume that the confidence level is 95% hence the level of significance is

$\alpha = (100-95)\%$

=> $\alpha = 0.05$

So the critical value of $\frac{\alpha }{2}$ obtained from the normal distribution table is

$Z_{\frac{\alpha }{2} } = 1.96$

Generally the margin of error is mathematically evaluated as

$E = Z_{\frac{\alpha }{2} } * SE$

$E = 1.96 * \frac{1}{4}$

$E = 0.49$

Generally the sample size is mathematically represented as

$n =[ \frac{Z_{\frac{\alpha }{2} * s^2}}{E}]^2$

=> $n = [\frac{1.96 * 1.5}{0.49} ]^2$

=> $n = 36$

6 0

4 years ago