please help me in this question

Answer:

It would take 19 hours and 36 minutes until there are 1040 bacteria present.

Step-by-step explanation:

Given that in a lab experiment, 610 bacteria are placed in a petri dish, and the conditions are such that the number of bacteria is able to double every 23 hours, to determine how long would it be, to the nearest tenth of an hour, until there are 1040 bacteria present, the following calculation must be performed:

610X = 1040

X = 1040/610

X = 1.7049

2 = 23

1.7049 = X

1.7049 x 23/2 = X

39.2131 / 2 = X

19.6 = X

100 = 60

60 = X

60 x 60/100 = X

36 = X

Therefore, it would take 19 hours and 36 minutes until there are 1040 bacteria present.

Answer:

x = 15

y = 6

Step-by-step explanation:

[tex]5 \sqrt{9} . \sqrt{6} \\ \\ = 5 \times 3. \sqrt{6} \\ \\ = 15 \sqrt{6} \\ equating \: it \: with \\ x \sqrt{y} \\we \: find \\ x = 15 \\ y = 6[/tex]

Answer:

16

Step-by-step explanation:

I don't know  how to explain but it is 16

Answer:

Since the Width (W) of the rectangle is not given, the answer would be Length (L) = 240/W

Step-by-step explanation:

A = L*W

240 = L*W

240/W = L

Answer:

[tex]forth \: line \: - 5x - 3x + 3 = 6 \\ - 8x + 3 = 6 \\ - 8x = 3 \\ x = \frac{3}{ - 8} [/tex]

Answer:

The lower bound of the 80% confidence interval of the average typing speed of a student of this college is of 68.516 words per minute.

Step-by-step explanation:

We have the standard deviation for the sample, which means that the t-interval is used to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 20 - 1 = 19

80% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 19 degrees of freedom(y-axis) and a confidence level of [tex]1 - \frac{1 - 0.8}{2} = 0.9[/tex]. So we have T = 1.328

The margin of error is:

[tex]M = T\frac{s}{\sqrt{n}} = 1.328\frac{5}{\sqrt{20}} = 1.484[/tex]

In which s is the standard deviation of the sample and n is the size of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 70 - 1.484 = 68.516 wpm.

The lower bound of the 80% confidence interval of the average typing speed of a student of this college is of 68.516 words per minute.

Answer:

x = 7.39

Step-by-step explanation:

log(x)²=(logx)², find the value of x​

log x² = log x * log x

2log x = log x * log x

2 = log x

Take the exponent pf both sides

e² = e^logx

e²  = x

x  = e²

x = 7.39

Answer:

4

Step-by-step explanation:

okay . so everything seems to be to the second power.

-1 to the second power = -1

3 x 3 = 9

-1 + 9 = 8 + -1 = 7

7 - 3 = 4

Answer:

6

Step-by-step explanation:

you can solve it on a T84 calculator. Just rewrite the equation with the variable's equivalent values.

I rewrote it as -1^2+3^2+1-3 and got 6. If you don't own a T84 calculator there are apps for it as well as websites for your laptop or pc. They can be very handy in a pinch!

Answer:

3960 minutes

Step-by-step explanation:

From;

0.693/t1/2 = 2.303/t log No/N

t1/2 = half life of 90Y

No = initial activity of 90Y =  8.9 x 10^5 disintegrations per minute

N= activity of 90Y after time t = 2.6 x 10^4 disintegrations per minute

t = time taken

Since the time elapsed is 20,235 minutes, we substitute into the formula above.

0.693/t1/2 = 2.303/20235 log 8.9 x 10^5/2.6 x 10^4

0.693/t1/2 =  1.75 * 10^-4

t1/2 = 0.693/ 1.75 * 10^-4

t1/2 = 3960 minutes

Answer:

22.35

Step-by-step explanation:

Take 22.3 and add .05

Opps, wrong answer

Deleted

Answer:

[tex]x > - 8[/tex]

Step-by-step explanation:

Swap the sides of the inequality and flip the inequality sign:

[tex] - 6x < 48[/tex]

Divide both side of the inequality by -6 and flip the inequality sign:

[tex]x > - 8[/tex]

[tex]48 > - 6x \\ \\ \\ Change \: The \: Sides \\ Of \: Value \: With \: Signs \\ \\ \implies - 6x < 48 \\ \\ \implies \: x > - 8[/tex]

Answer:

trick:

1 hour = 60 minutes

ex if said to convert 25 minutes to hour so

1 hour/60=1minutes

multiply both sides with 25

25 x 1hour/60=25minutes

5/12 hours=25 minutes

just like that for hour

Answer:

Liz made $30.50 more than Hal

Step-by-step explanation:

  87.00

-  56.50

________

   30.50

or

87.00-56.50=30.50

Answer:

8.13

Step-by-step explanation:

125 x .065 = 8.13

Answer:

62°

Step-by-step explanation:

In an isosceles triangle, angle opposite to equal sides are equal.

So according to angle sum property :

x + x + 56 = 180

2x + 56 = 180

x = 180 - 56 /2

x = 62°

Answer:

B. g(x)= |x| + 5

Step-by-step explanation:

-5 represents a vertical shift down, so that narrows it down to either A or B. A shows a shift across the horizontal (X) axis, so it must be B.

Answer:

17

Step-by-step explanation:

8.5 / 0.5

Answer:

[tex] log_{3}( {x}^{3} + {2x}^{2})[/tex]

Answer:

Answer:

log_{3}( {x}^{3} + {2x}^{2})log

3

(x

3

+2x

2

Answer:

hi there so if a = 5cm b =12cm c=13cm the area is 30cm the perimeter 30cm

Step-by-step explanation:

Answer:it would be thirty

Step-by-step explanation:

Answer:

Step-by-step explanation:

Answer:

Rotation

Step-by-step explanation:

Its not a dilation because that is making a shape bigger or smaller, assuming you can only do one it cant be a reflection. and none is wrong. so It has to be rotation

Answer:

Its D

Step-by-step explanation:

Using the binomial distribution, it is found that the mean and the standard deviation of X are given as follows:

[tex]\mu_X = 3, \sigma_X = 0.87[/tex]

The expected value of the binomial distribution is:

[tex]\mu_X = np[/tex]

The standard deviation of the binomial distribution is:

[tex]\sigma_X = \sqrt{np(1-p)}[/tex]

In this problem, the proportion and the sample size are given as follows:

Hence, the mean and the standard deviation are given by:

[tex]\mu_X = np = 4(0.75) = 3[/tex]

[tex]\sigma_X = \sqrt{np(1-p)} = \sqrt{4(0.75)(0.25)} = 0.87[/tex]

More can be learned about the binomial distribution at https://brainly.com/question/24863377

#SPJ2

Answer:

The null hypothesis must be rejected

Step-by-step explanation:

Here the P value is less than 0.05

which means that the test results are statistically significant and there are sufficient evidence to reject the null hypothesis and accept the alternative hypothesis.

Hence, the null hypothesis must be rejected.

Answer: sum of ZABC and ZCBD