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lidiya [134]
3 years ago
6

Help again please Sorry :|

Mathematics
1 answer:
yuradex [85]3 years ago
4 0

Answer:

go along to -4 do a dot, form -4 go to 4 and do a dot, go to 0 and go along to 4 and up to 4 and do a dot , join the dots to make rectangle, hope this helped

Step-by-step explanation:

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asambeis [7]
[-(+2)(-3)(-1)(+4)=]

- (+2)(-3)(-1)(+4)=
- (-6)(-1)(+4)
(6)(-4) = -24
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2 years ago
Find the value of x.
AnnyKZ [126]

Answer: 69

Step-by-step explanation: a triangle adds up to 180 degrees. It is an isosceles triangle (2 sides are the same angle) 180-42=138 then do 138/2=69

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2 years ago
Lisa is now six years older than Cheryl. In two years, Lisa will be twice as old as Cheryl. How old is Lisa now?
Elena-2011 [213]
--------------------------------------------------
Define x :
--------------------------------------------------
Let Cheryl be x years old.
Cheryl = x
Lisa = x + 6

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In two years time:
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Cheryl = x + 2
Lisa = x + 8

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Lisa will be twice as old as Cheryl :
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x + 8 = 2(x + 2)

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Solve x :
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x + 8 = 2(x + 2)
x + 8 = 2x + 4
x = 4

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Find their age :
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Cheryl = x = 4
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4 0
3 years ago
If a dice is Rolled find the probibllity
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7 0
3 years ago
A phone manufacturer wants to compete in the touch screen phone market. He understands that the lead product has a battery life
alisha [4.7K]

Answer:

a)

The null hypothesis is H_0: \mu \leq 10

The alternative hypothesis is H_1: \mu > 10

b-1) The value of the test statistic is t = 1.86.

b-2) The p-value is of 0.0348.

Step-by-step explanation:

Question a:

Test if the battery life is more than twice of 5 hours:

Twice of 5 hours = 5*2 = 10 hours.

At the null hypothesis, we test if the battery life is of 10 hours or less, than is:

H_0: \mu \leq 10

At the alternative hypothesis, we test if the battery life is of more than 10 hours, that is:

H_1: \mu > 10

b-1. Calculate the value of the test statistic.

The test statistic is:

We have the standard deviation for the sample, so the t-distribution is used to solve this question

t = \frac{X - \mu}{\frac{s}{\sqrt{n}}}

In which X is the sample mean, \mu is the value tested at the null hypothesis, s is the standard deviation and n is the size of the sample.

10 is tested at the null hypothesis:

This means that \mu = 10

In order to test the claim, a researcher samples 45 units of the new phone and finds that the sample battery life averages 10.5 hours with a sample standard deviation of 1.8 hours.

This means that n = 45, X = 10.5, s = 1.8

Then

t = \frac{X - \mu}{\frac{s}{\sqrt{n}}}

t = \frac{10.5 - 10}{\frac{1.8}{\sqrt{45}}}

t = 1.86

The value of the test statistic is t = 1.86.

b-2. Find the p-value.

Testing if the mean is more than a value, so a right-tailed test.

Sample of 45, so 45 - 1 = 44 degrees of freedom.

Test statistic t = 1.86.

Using a t-distribution calculator, the p-value is of 0.0348.

5 0
2 years ago
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