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3 years ago

I don’t know what the formula is and how to work it out, please help.

Mathematics

1 answer:

scZoUnD [109]3 years ago

6 0

Whenever you have straight lines on a graph they mean that that they only have either an x value or a y value. Normally you would have both, right?
so,
1. what is k doing? Its a horizontal line so it will be all y values at the point where it crosses the y axis. Here it looks like it crosses at the 8 mark so the value of this is y=8
2, line 1 crosses the x axis so it is all x values. here it crosses at 1 so its equation is x=1 the line parallel to it crosses x at 7 so its equation is x=7
The last line to describe crosses y at 2 so its equation is y=2.
3. The area is easy just count all the squares inside the figure. Or the formula is length times width.

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Anthony bought an 8 foot board. He cut off 3/4 off the board to build a shelf and gave 1/3 of the rest to his brother for an art

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8 inches. 3/4 of 8 feet is 6 feet leaving two left over, one third of that is 8 inches.

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3 years ago

Read 2 more answers

Please help!!! This is one question with a couple parts I am extremely confused and it would be amazing if you could show steps!

Dovator [93]

Answer:

a) |n -11| = 5

b) n ∈ {6, 16}

Step-by-step explanation:

The wording of the question is ridiculous. We assume it is intended to read, "The distance between two numbers is 5. One of the numbers is 11. What are the possibilities for the other?"

a) The distance between a number (n) and 11 can be written as ...

|n -11|

Since we want that distance to be 5, we can write the equation ...

|n -11| = 5

b) The equation resolves to two:

n -11 = 5
n -11 = -5

Adding 11 to both sides of both equations gives ...

n = 16
n = 6

The two solutions are n=6 and n=16.

_____

<em>Comment on the question statement</em>

Increasingly, we see curriculum materials written in Pidgin English or where the words have a meaning different from that understood by a native English speaker. It appears you are the lucky recipient of such materials, so must do occasional "interpretation". Here, it seems that "two time a number" is intended to mean "two numbers."

4 0

3 years ago

(-3,2); m = 4 write an equation of the line that passes through the given point and has the given slope

Illusion [34]

2=4(-3) + b
2= -12 + b
14= b
Y=4x + 14

6 0

3 years ago

Clarinex is a drug used to treat asthma. In clinical tests of this drug, 1655 patients were treated with 5- mg doses of Clarinex

bagirrra123 [75]

Answer:

$z=\frac{0.021 -0.012}{\sqrt{\frac{0.012(1-0.012)}{1655}}}=3.363$

$p_v =P(z>3.363)=0.00039$

So the p value obtained was a very low value and using the significance level given $\alpha=0.01$ we have $p_v$ so we can conclude that we have enough evidence to reject the null hypothesis, and we can said that at 1% of significance the proportion of interest is significantly higher than 0.012 (1.2%)

Step-by-step explanation:

Data given and notation

n=1655 represent the random sample taken

$\hat p=0.021$ estimated proportion of interest

$p_o=0.012$ is the value that we want to test

$\alpha=0.01$ represent the significance level

Confidence=99% or 0.99

z would represent the statistic (variable of interest)

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

Concepts and formulas to use

We need to conduct a hypothesis in order to test the claim that true proportions is higher than 0.012.:

Null hypothesis: $p \leq 0.012$

Alternative hypothesis: $p > 0.012$

When we conduct a proportion test we need to use the z statisitic, and the is given by:

$z=\frac{\hat p -p_o}{\sqrt{\frac{p_o (1-p_o)}{n}}}$ (1)

The One-Sample Proportion Test is used to assess whether a population proportion $\hat p$ is significantly different from a hypothesized value $p_o$ .

Calculate the statistic

Since we have all the info requires we can replace in formula (1) like this:

$z=\frac{0.021 -0.012}{\sqrt{\frac{0.012(1-0.012)}{1655}}}=3.363$

Statistical decision

It's important to refresh the p value method or p value approach . "This method is about determining "likely" or "unlikely" by determining the probability assuming the null hypothesis were true of observing a more extreme test statistic in the direction of the alternative hypothesis than the one observed". Or in other words is just a method to have an statistical decision to fail to reject or reject the null hypothesis.

The significance level provided $\alpha=0.01$ . The next step would be calculate the p value for this test.

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

$p_v =P(z>3.363)=0.00039$

3 0

3 years ago

Anna enjoys dinner with her family at a restaurant in Washington, D.C. She leaves a 15% tip on the price of her meal. She also h

AnnZ [28]

Answer:

$22

Step-by-step explanation:

tax and the tip increase the price paid for the meal

she paid 15 + 10 = 25% more than the price of her meal

p = original price

1.15 x p = 27,50

p = 27.50 / 1.15 = 22

3 0

3 years ago