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3 years ago

How is solving equations different from solving inequalities?

Mathematics

1 answer:

Evgen [1.6K]3 years ago

7 0

Answer: Sometimes you may have to flip the sign on inequalities when your dividing or multiplying by a negative.

Step-by-step explanation:

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The Highway Safety Department wants to study the driving habits of individuals. A sample of 40 cars traveling on a particular st

Ipatiy [6.2K]

Answer:

We need a sample size of at least 101

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.99}{2} = 0.005$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.005 = 0.995$ , so $z = 2.575$

Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

What sample size is needed to estimate the true average speed to within 2 mph at 99% confidence?

We need a sample of at least n.

n is found when M = 2. So

$M = z*\frac{\sigma}{\sqrt{n}}$

$2 = 2.575*\frac{7.8}{\sqrt{n}}$

$2\sqrt{n} = 2.575*7.8$

$\sqrt{n} = \frac{2.575*7.8}{2}$

$(\sqrt{n})^{2} = (\frac{2.575*7.8}{2})^{2}$

$n = 100.85$

Rounding up

We need a sample size of at least 101

8 0

3 years ago

Read 2 more answers

I will give brainliest answer

Llana [10]

Answer:

Delta = |a b d; b c f; d f g|

(2)

J = |a b; b c|

(3)

I = a+c

(4)

K = |a d; d g|+|c f; f g|.

Step-by-step explanation:

4 0

3 years ago

Read 2 more answers

HELP PLS APASAPA I WILL GIVE BRAIN

Alex777 [14]

Answer:

you answer will be a binary number

7 0

2 years ago

Simpfly 8x + 7 – 2x – 4

Aliun [14]

Answer:

Hi there!

The answer to this question is: 6x+3

Step-by-step explanation:

Step 1: combine alike terms

in the equation there are two numbers that end with x: 8x and -2x

you simply add them together to get 6x

Step 2: combine numbers

in this equations there are two numbers: 7 and -4

you simply add them together to get 3

Then your final answer should be 6x+3

8 0

3 years ago

Evaluate the expression when C=1/2 and D=1/12<br> 3(1/4+C²)+2D<br> Please hurry!

Mkey [24]

Answer is 1 1/12
3(1/4 + 1/2^2)+ (2x1/12)
3/4+1/4+2/12 (you get to this part by distributing 3 throughout the parentheses)
9/12+3/12+2/12= 1 1/12 hope this helps

4 0

3 years ago

Read 2 more answers