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2 years ago

What is the answer expand and simplify 3x-2^2

Mathematics

1 answer:

tensa zangetsu [6.8K]2 years ago

3 0

Answer:

3x^2 - 4

Step-by-step explanation:

3x^2 - 2^2

3x^2 - 4

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Find the missing side round to the nearest tenth can someone please help me this is my last question

jeka57 [31]

The question is related to trigonometric ratio rule .

In the given diagram, there is a right angle triangle, with adjacent =57, and the unknown side is y. Given angle measurement is 39 .

To find the measurement of y, we will use tan rule which is

$tan \Theta = \frac{opposite}{adjacent}$

$tan 39=\frac{y}{57}$

y = 57 tan 39 = 46.2

8 0

2 years ago

{12x + 4y = 15232x + 12y = 42012x + 4y = 15232x + 12y = 420 In the equations, xx represents the cost of a chicken lunch and yy r

a_sh-v [17]

{12x 4y = 15232x 12y = 42012x 4y = 15232x 12y = 420?In the equations, xx represents the cost of a chicken lunch and yy represents the cost of a v.... I think... "Xx represents the cost of a chicken lunch..."

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2 years ago

Y = 3x + 13 y = -2x - 22 substitution method show work pls someone help quick

laiz [17]

Answer:

x = -7

Step-by-step explanation:

3x + 13 = -2x - 22

subtract 13 from both sides

3x = -2x - 35

Add 2x to both sides

5x = -35

Divide each side by 5

x = -7

5 0

2 years ago

A large on-demand, video streaming company is designing a large-scale survey to determine the mean amount of time corporate exec

Firdavs [7]

Answer:

554 executives should be surveyed.

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:

$\alpha = \frac{1 - 0.95}{2} = 0.025$

Now, we have to find z in the Z-table as such z has a p-value of $1 - \alpha$ .

That is z with a pvalue of $1 - 0.025 = 0.975$ , so Z = 1.96.

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.

Standard deviation of 3 hours.

This means that $\sigma = 3$

The 95% level of confidence is to be used. How many executives should be surveyed?

n executives should be surveyed, and n is found with $M = 0.25$ . So

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

$0.25 = 1.96\frac{3}{\sqrt{n}}$

$0.25\sqrt{n} = 1.96*3$

$\sqrt{n} = \frac{1.96*3}{0.25}$

$(\sqrt{n})^2 = (\frac{1.96*3}{0.25})^2$

$n = 553.2$

Rounding up:

554 executives should be surveyed.

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2 years ago

Ramon drew boxplots to summarize the number of pages in each chapter of two books. The value of the interquartile ranges of thes

Brut [27]

Answer:

The answer is c

Step-by-step explanation:

The middle line is in the same spot

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2 years ago