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3 years ago

(4x+1)(5x-2) What’s the answer

Mathematics

2 answers:

Helen [10]3 years ago

7 0

Answer:

stated in final line in the pic

Step-by-step explanation:

refer to the picture

lukranit [14]3 years ago

4 0

Answer:

hey mate your answer is

20x²-3x-2

please follow me...

and Mark it as a brainlist answer.....

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Use a calculator to approximate an angle measure for cos-1 0.7439

ivolga24 [154]

Your answer is 41.93529593 or 41.9

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3 years ago

Two angles are supplementary. One angle measures 52 degrees more than the other angle. Find the measure of the LARGER angle.

mote1985 [20]

$\begin{array}{l}\text{We\ have\ } \alpha +\beta =180\ \text{and} \ \beta =\alpha +52\text{\ then}\\\\\alpha +\alpha +52=180\\\\\Longrightarrow 2\alpha =180-52\\\\\Longrightarrow \alpha =\frac{128}{2} =64\\\\\therefore \beta =64+52=116\\\\\therefore \boxed{\text{The\ larger\ angle\ is\ 116\ degrees}}\end{array}$

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3 years ago

if anyone figures out this riddle i will give you 10 bucks (ik its not a lot of money but its an easy riddle) What has ring but

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So easy it is a telephone

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2 years ago

Read 2 more answers

Randomly selected students participated in an experiment to test their ability to determine when one minute (or sixty seconds)

zalisa [80]

Answer: $(57.41,\ 62.19)$

Step-by-step explanation:

Given : Sample size : $n=40$

Sample mean : $\overline{x}=59.8\text{ seconds}$

Standard deviation : $\sigma =9.2\text{ seconds}$

Significance level : $\alpha=1-0.9=0.1$

Critical value : $z_{\alpha/2}=1.645$

Formula to find the confidence interval for population mean :-

$\overline{x}\pm z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}\\\\=59.8\pm(1.645)\dfrac{9.2}{\sqrt{40}}\\\\\approx59.8\pm2.39\\\\=(59.8-2.39,\ 59.8+2.39)\\\\=(57.41,\ 62.19)$

Hence, a 90% confidence interval estimate of the population mean of all students = $(57.41,\ 62.19)$

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3 years ago

A salesman at a clothing store makes a sale to 30% of the customers he talks to, and wants to try out a new tecnique to see if h

Alexus [3.1K]

Answer:

Yes, we can conclude that average sales has changed.

Step-by-step explanation:

The null hypothesis, H0 : μ = 0.3

The alternative ; H0 : μ ≠ 0.3

The result of the 95% confidence interval of (.3095, .3275); This shows that the confidence interval is now between 30.95% and 32.75% ; since μ does not lie within the confidence interval value and the lower boundary of the confidence interval is > 30; we Can conclude with an evidence of 5% significance that his average sales as changed (increased).

We can reject H0 and conclude that μ > 0.3

7 0

3 years ago