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3 years ago

Help plz:))) I’ll mark u brainliest ASAP!!!!!

Mathematics

2 answers:

anygoal [31]3 years ago

8 0

Answer:

X= 24

la neta no se

Marina CMI [18]3 years ago

7 0

Answer:

x = 8.3

Step-by-step explanation:

Triangles always equal to 180 degrees when taking about angles.

The equation would be:

30+(11x+5)+(-5+7x)= 180

add like variables:

30+5-5 = 30

11x+7x = 18x

put them into an equation:

18x +30= 180

cancel out:

18x+30=180

-30 -30

18x = 150

Divide:

18x = 150

÷ 18 ÷18

x = 8.3

This is an estimate as the answer in the calculator would be very long.

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David tracks his calories burned while training for a meet. The number of calories he burns is expressed by the function c(t) =

masya89 [10]

Answer: $b[c(t)] = 915.2t$

Step-by-step explanation:

Given : David tracks his calories burned while training for a meet. The number of calories he burns is expressed by the function

$c(t) = 704t$ , where t is the number of hours spent swimming.

The number of calories he burns while wearing flippers is expressed by the function $b(c) = 1.3c$ , where c is the number of calories burned while swimming without flippers.

The composite functions expresses the calories, as a function of time, David burns while swimming with flippers will be :-

$b(c(t))=1.3(704t)=915.2t$

4 0

3 years ago

What was R-kelly doing in the basement<br> Right answers only ;-;

LenKa [72]

Answer:

Sum he wasn't suupposed to be doing....... ;-;

Step-by-step explanation:

8 0

3 years ago

What are the solutions of the equation x4 – 5x2 – 36 = 0? Use factoring to solve.

pentagon [3]

Answer:

x=+/-3

Step-by-step explanation:

x^4-5x^2-36=0

factor

(x^2-9)(x^2+4)=0

split into 2 equations because one of these terms will need to equal zero for the eqation to be true

x^2-9=0 x^2+4=0

x^2=9 x^2=-4

x=+/-3 no real numbers

7 0

3 years ago

In the book Essentials of Marketing Research, William R. Dillon, Thomas J. Madden, and Neil H. Firtle discuss a research proposa

Ratling [72]

Answer:

The null hypothesis is given as $H_o : p_1-p_2=0$ while the alternate hypothesis is $H_A: p_1-p_2\neq 0$

Step-by-step explanation:

As per the the given data

p1=Proportion of Homeowners who would buy the security system

p2=Proportion of Renters who would buy the security system

As the null hypothesis states that there is no difference in the test thus it is given as

$H_o : p_1-p_2=0$

This states that there is no difference between the probabilities of the homeowners buying the security system and the renters buying the security system.

The Alternative hypothesis is the other possibility of the null hypothesis. i.e It negates the null Hypothesis and is given as

$H_A: p_1-p_2\neq 0$

3 0

4 years ago

A fast food restaurant executive wishes to know how many fast food meals adults eat each week. They want to construct a 98% conf

adelina 88 [10]

Answer:

$n=(\frac{2.326(1.1)}{0.07})^2 =1336.006 \approx 1337$

So the answer for this case would be n=1337 rounded up to the nearest integer

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

$\bar X$ represent the sample mean for the sample

$\mu$ population mean (variable of interest)

$\sigma=1.1$ represent the population standard deviation

n represent the sample size

Solution to the problem

The margin of error is given by this formula:

$ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (a)

And on this case we have that ME =0.07 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

$n=(\frac{z_{\alpha/2} \sigma}{ME})^2$ (b)

The critical value for 98% of confidence interval now can be founded using the normal distribution. And in excel we can use this formula to find it:"=-NORM.INV(0.01;0;1)", and we got $z_{\alpha/2}=2.326$ , replacing into formula (b) we got:

$n=(\frac{2.326(1.1)}{0.07})^2 =1336.006 \approx 1337$

So the answer for this case would be n=1337 rounded up to the nearest integer

3 0

4 years ago