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3 years ago

I need help ASAP ! Please help me

Mathematics

1 answer:

Sonbull [250]3 years ago

8 0

It would be h=V/lw (the first one).
Here are the steps:
Since h is on the right side of the equation, switch the sides so it is on the left side of the equation.lwh=V Then, you would divide each term by lw and simplify.
Hope this helps!

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Write a data set of any 5 numbers that has a median equal to 7

ELEN [110]

Since there are 5 numbers, the median will be the middle number.

examples of answers to this question: 6 7 7 7 7 (median is 7)

1 2 7 7 9 (median is 7)

2 3 7 8 9 (median is 7)

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3 years ago

Write a numerical expression that satisfies all of the following conditions. • The only number used in the expression is 3. At l

Paladinen [302]

Answer:

To evaluate a variable expression means to find the value of the expression when the variable is (or variables are) replaced by a number (or numbers).

Here is a variable expression: 3x+7.

To evaluate this expression when x=2 mean to substitute 2 in place of x, and find the number (the value). [see note below]

3(2)+7=6+7=13.

When x=2, the expression has a value of `13.

If we evaluate the same expression when x=10, we get:

3(10)+7=30+7=37.

Here's a variable expression with two variables : 3x−2y

In order to evaluate this expression, we'll need values (numbers) for both x and y.

Evaluate the expression 3x−2y when x=4 and y=5

3(4)−2(5)=12−10=2

If we change the values to x=5 and y=4, we get

3(5)−2(4)=15−8=7.

Note:

To avoid saying exactly the same thing over and over, we use the following to mean the same thing:

evaluate the expression when x=2

evaluate the expression for x=2

evaluate the expression at x=2

evaluate the expression assuming x=2

evaluate the expression if x=2

Also

If there is only one variable in an expression, we don't always need to mention it:

evaluate the expression for 2

evaluate the expression at 2

7 0

3 years ago

Write the equations of three distinct lines to have the same y-intercept -one

Vlad [161]

The slope-intercept form:

$y=mx+b$

m - slope

b - y-intercept

Answer:

y = -2x + 1

y = 0.6x + 1

y = x + 1

y = 1

y-intercept = 1

3 0

3 years ago

A company decided to test the hypothesis that the average time a company’s employees are spending to check their private e-mails

Degger [83]

Answer:

$z=\frac{6.6-6}{\frac{1.7}{\sqrt{40}}}=2.232$

Since is a one sided right tailed test the p value would be:

$p_v =P(z>2.232)=0.0128$

Step-by-step explanation:

Data given and notation

$\bar X=6.6$ represent the sample mean

$\sigma=1.7$ represent the population standard deviation

$n=40$ sample size

$\mu_o =6$ represent the value that we want to test

$\alpha=0.05$ represent the significance level for the hypothesis test.

t would represent the statistic (variable of interest)

$p_v$ represent the p value for the test (variable of interest)

State the null and alternative hypotheses.

We need to conduct a hypothesis in order to check if the true mean is higher than 6minutes or no, the system of hypothesis would be:

Null hypothesis: $\mu \leq 6$

Alternative hypothesis: $\mu > 6$

If we analyze the size for the sample is > 30 and we know the population deviation so is better apply a z test to compare the actual mean to the reference value, and the statistic is given by:

$z=\frac{\bar X-\mu_o}{\frac{\sigma}{\sqrt{n}}}$ (1)

z-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".

Calculate the statistic

We can replace in formula (1) the info given like this:

$z=\frac{6.6-6}{\frac{1.7}{\sqrt{40}}}=2.232$

P-value

Since is a one sided right tailed test the p value would be:

$p_v =P(z>2.232)=0.0128$

5 0

3 years ago

HELP ASAP!! Are the expressions –0.5(3x + 5) and –1.5x + 2.5 equivalent? Explain why or why not.

Vikentia [17]

Answer:

No because one is negative and the other one is positive

Step-by-step explanation:

6 0

3 years ago