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LekaFEV [45]
3 years ago
15

PLEASE HELP!!!!! WILL MARK BRAINLIEST!!!!

Mathematics
2 answers:
Kruka [31]3 years ago
8 0

Answer:

Yes (reasoning below)

Step-by-step explanation:

A function relates an input to an output. It is like a machine that has an input and an output. And the output is related somehow to the input.

never [62]3 years ago
3 0

Answer:

No (please see below for reasoning).

Step-by-step explanation:

Hello there!

We are given the graph of a vertical parabola and we want to figure out if it's a function or not.

A function has ONE output for every input. In other words, if you put one thing into a function, you're only going to get ONE thing back out.

One analogy to think about this is a vending machine; if you press one code (the input), you're only going to get one snack (let's say, chips), and if you a specific code, the only possible snack for that code would be the chips (the output). In simpler terms, if you press 3D on a vending machine, you're only getting the chips. You're not getting the cookies and the chips. 3D can't correspond to both chips and cookies.

One way to figure out if an equation is a function if you're given the graph is to do the vertical line test, where you will draw a vertical line through the graph. If the line hits two or more points in the graph, that means the input has more than one output, which wouldn't be a function.

So draw a vertical line through the graph.

Please see the picture below for the visual representation. Notice how the blue line hits two points on the graph. This means it isn't a function, since it means that the input (the value of x) has more than one output (the y values on the graph).  Remeber that, for a function, we only can have one output for every input.

Hope this helps!

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If 25=4x-7, then x =
sasho [114]

Answer:

x=8

Step-by-step explanation:

Move all terms that don't contain  x  to the right side and solve.

6 0
3 years ago
A survey of 700 adults from a certain region​ asked, "What do you buy from your mobile​ device?" The results indicated that 59​%
Kryger [21]

Answer:

a) the test statistic z = 1.891

the null hypothesis accepted at 95% level of significance

b) the critical values of 95% level of significance is zα =1.96

c) 95% of confidence intervals are  (0.523 ,0.596)

Step-by-step explanation:

A survey of 700 adults from a certain region

Given sample sizes n_{1} = 400 and n_{2} = 300

Proportion of mean p_{1} = \frac{236}{400} = 0.59 and p_{2} = \frac{156}{300} = 0.52

<u>Null hypothesis H0</u> : assume that there is no significant difference between males and women reported they buy clothing from their mobile device

p1 = p2

<u>Alternative hypothesis H1:</u>- p1 ≠ p2

a) The test statistic is

Z = \frac{p_{1} -p_{2} }{\sqrt{pq(\frac{1}{n_{1} }+\frac{1}{n_{2} )}  } }

where p = \frac{n_{1}p_{1} +n_{2}p_{2} }{n_{1}+n_{2}}= \frac{400X0.59+300X0.52}{700}  

on calculation we get   p = 0.56    

now q =1-p = 1-0.56=0.44

Z = \frac{p_{1} -p_{2} }{\sqrt{pq(\frac{1}{n_{1} }+\frac{1}{n_{2} )}  } }\\   =\frac{0.56-0.52}{\sqrt{0.56X0.44}(\frac{1}{400}+\frac{1}{300}   }

after calculation we get z = 1.891

b) The critical value at 95% confidence interval zα = 1.96 (from z-table)

The calculated z- value < the tabulated value

therefore the null hypothesis accepted

<u>conclusion</u>:-

assume that there is no significant difference between males and women reported they buy clothing from their mobile device

p1 = p2

c) <u>95% confidence intervals</u>

The confidence intervals are P± 1.96(√PQ/n)

we know that = p = \frac{n_{1}p_{1} +n_{2}p_{2} }{n_{1}+n_{2}}= \frac{400X0.59+300X0.52}{700}

after calculation we get P = 0.56 and Q =1-P =0.44

Confidence intervals are ( P- 1.96(√PQ/n), P+ 1.96(√PQ/n))

now substitute values , we get

( 0.56- 1.96(√0.56X0.44/700), 0.56+ 1.96(0.56X0.44/700))

on simplification we get (0.523 ,0.596)

Therefore the population proportion (0.56) lies in between the 95% of <u>confidence intervals  (0.523 ,0.596)</u>

<u></u>

3 0
3 years ago
What percent of the bottle of apple juice is water?
Anettt [7]

percent of water is: 32/80*100= 40%

5 0
3 years ago
can someone help me please? Lines AB and CD are perpendicular to each other. If 1 measures (3x + 3)°, and 2 measures 39°, what i
tester [92]

Answer:

x = 16

Step-by-step explanation:

Angle 2 is equal to 39, which means that Angle 1 has to be 51, since Angles 1 and 2 together is a right angle

3x+3=51

Subtract 3, making it 48

Now do 48 divided by 3, and you get 16

4 0
3 years ago
Read 2 more answers
Nai’s dogs eats 1 1/5 cups of dog food per day. If nai has 12 cups of dog food left how many days can nai feed his dog before ha
vladimir1956 [14]

Answer:

option A.. 10 days

Step-by-step explanation:

option is 10 days is the correct answer

in one day he eats = 1and1/5 cups = 6/5 cups

one cup last for = 5/6 day

12 cups last for days = 12× 5/6 = 2× 5 = 10 days

so correct answer is 10 days ... option A

plz mark my answer as brainlist plzzzz vote me.. also Hope <u>it</u><u> </u><u>will</u><u> be</u><u> helpful</u><u> for</u><u> you</u>

7 0
3 years ago
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