Someone wanna help me, Maths my weakest subject. I need it done by 11

Answer:

[tex]n_1=(3 + 1\sqrt{5} )/2\\\\n_2=(3 - 1\sqrt{5} )/2[/tex]

Step-by-step explanation:

[tex]2n^2= 6n - 2\\\\2n^2-6n+2=0\\\\a=2\\\\b=-6\\\\c=2[/tex]

[tex]n=(-b \pm \sqrt{b^2-4ac} )/2a\\\\n=(-(-6) \pm \sqrt{(-6)^2-4(2)(2)} )/2(2)\\\\n=(6 \pm \sqrt{36-16} )/4\\\\n=(6 \pm \sqrt{20} )/4\\\\n=(6 \pm 2\sqrt{5} )/4\\\\n=(3 \pm 1\sqrt{5} )/2\\\\n_1=(3 + 1\sqrt{5} )/2\\\\n_2=(3 - 1\sqrt{5} )/2[/tex]

Answer:

In 4 days approx. 1527 cars were washed over a 4-day period.

Step-by-step explanation:

To find out how many cars were washed in these 3 washes over 4 days as long as they stay at the same constant number, simply multiply the number of cars each wash washes a day by 4 then add it all together. See below:

145 x 4 = 580

211 x 4 = 211

184 x 4 = 736

580 + 211 + 736 = 1527

So, in 4 days approx. 1527 cars were washed over a 4-day period.

Hope this helps! If you have any additional questions, please don't hesitate to ask me or your teacher to be sure you master the subject. Stay safe and please mark brainliest!

Answer:

The pair that performs second are Orville and Nancy.

Step-by-step explanation:

Since Jack and Leslie are partners and that they appear before Kelly, it is safe to assume that this pair may come first beforehand in which Orville also comes on before Kelly.  Nancy also appears before Leslie and since each pair has a female and a male, it is safe to assume that Orville and Nancy perform second while Jack and Leslie perform first and Kelly and Marty perform last.

Answer:

13

Step-by-step explanation:

This problem is an example of pigeonhole principle which states that If n+ 1 objects are placed into n boxes, then some box contains at least 2 objects.

Here no. of months in a year are boxes n = 12.

Therefore number of objects( people) = n+1= 13.

Then,at least two people  in the group whose birthdays fall in the same month.

Answer:

$8.59

Step-by-step explanation:

5:$42.95

5 divided by 5=1

$42.95 divided by 5=$8.59

$8.59 per glove

Answer:

The slope would be 2.5

Step-by-step explanation:

Rise over run, pick 2 points 50/20= 2.5

Answer:

D; 2 miles

Step-by-step explanation:

Please Mark my answer Brainliest!

Answer:

The value is  [tex]P(X = 12) =  0.0356 [/tex]

Step-by-step explanation:

From the question we are told that

   The number of boys in the class is  [tex]b = 12[/tex]

   The number of girls in the class is  [tex]g = 8[/tex]

   The total number of students is  is  n  =  20

    The number of weeks is  N  = 20

The probability of selecting a girl is mathematically represented as

     [tex]p = \frac{8}{20}[/tex]

=> [tex]p = 0.4[/tex]

The probability of not  selecting a girl is mathematically represented as  

     [tex]q = 1- \frac{8}{20}[/tex]

=> [tex]q =0.6[/tex]

Generally the selection of students from the class  follows a binomial distribution  

i.e  

         [tex]X  \~ \ \ \  B(n , p)[/tex]

and the probability distribution function for binomial  distribution is  

      [tex]P(X = x) =  ^{N}C_x *  p^x *  (q)^{n-x}[/tex]

Here C stands for combination hence we are going to be making use of the combination function in our calculators  

Generally the probability that there are exactly 12 weeks in which a girl is selected is mathematically represented as

      [tex]P(X = 12) =  ^{20}C_{12} *  0.4^{12} *  (0.6)^{20-12}[/tex]

      [tex]P(X = 12) =  125970 *  [1.678*10^{-5}]*  0.016796 [/tex]

=>   [tex]P(X = 12) =  0.0356 [/tex]

Answer:

true

Step-by-step explanation:

as negative takeaway a negative is positive so 8-(-4)= 8+4=12

Answer:

True

Step-by-step explanation:

- * - = +

8 + 4 = 12

so it's true

Answer:

356700

Step-by-step explanation:

By calculation using calculator

Answer:

B

Step-by-step explanation:

You would need to convert the fractions to a denominator of 15 because it's the closest denominator for both.

So 1 and 2/5 can be changed to 1 and 6/15

And 1 and 1/3 can be changed to 5/15

So what you do is multiply both the numerator and denominator by how much you need to multiply to get to 15 and the denominator.

You would then add the fractions, leaving the answer to be 2 and 11/15 

So for example 2 * 3 = 6 and 5 * 3 = 15, meaning the fraction would be 6/15

Step-by-step explanation:

L.H.S=(1-cosB)(1+cosB)

=(1-cos^2B). {using (a+b) (a-b)=(a^2-b^2)in second step}

=sin^2B

=1/cosec^2B

Therefore,L.H.S=R.H.S proved

Answer:

40

Step-by-step explanation:

because if its between the lines and its negitive and you change it to positive then it well be 31 +9

Answer:

2

Step-by-step explanation:

1--7=8

3--1=4

8/4=2

Answer:

A is the answer

Step-by-step explanation:

Answer:

You had $30

Step-by-step explanation:

The answer is 30 because he said that he had 10 dollars and 20 which means he had 30 dollars the other money was given to him.

P.S Can I have brainliest? (I don't deserve brainliest the other guy got it first.)

Answer:

You had $10 in the begging but got/found more.

Step-by-step explanation:

Answer:

x = 41.2

Step-by-step explanation:

Assuming the dotted line at the top is parallel to the segment with length x, it follows from the alternate interior angles theorem that the interior angle of the triangle (marked in diagram) is also 27º.

Using SOH-CAH-TOA, we get that tan(27º) = 21/x, so x = 21/tan(27º), which is approximately equal to 41.2.

Answer:

Another length of this diagram FE=12.

Step-by-step explanation:

According to diagram

In triangle FED, EM is perpendicular bisector of FD.

In ΔFED, EM ⊥ FD and FM=MD

In ΔFME and ΔDME

FM=DM                       (Given)

∠FME=∠DME             (each 90°)

ME=ME                       (Common)

ΔFME ≅ ΔDME  (By SAS congruence property)

Therefore, FE≅DE  (by CPCT)

But DE=12

So, FE=12

Thus, Another length of this diagram FE=12.

Step-by-step explanation:

Answer:

$22.50

Step-by-step explanation:

5 x 6 = 30 slices

30 x 0.75 = $22.5

Answer:

I think 22.5 dollars for the total

Answer:

Given - 8 lemons is of $6

To find - Price of 1 lemon

Solution -

8 lemons = $ 6

1 lemon = ?

1 * 6 / 8

6/8

3/4

0.75 $

Answer:

6.33 m/s

Step-by-step explanation:

Given that,

The world record for the men’s 10000 meters was 26 minutes 17.53 seconds.

Distance = 10000 m

Time, t = 26 minutes 17.53 seconds = 1577.53 s

We need to find the average speed throughout the race. It is equal to total distance divided by total time taken.

[tex]v=\dfrac{10000\ m}{1577.53\ s}\\\\=6.33\ m/s[/tex]

So, the average speed is 6.33 m/s.

Answer:

[tex] y = \frac{z^2 - x}{2} [/tex]

Step-by-step explanation:

Given:

[tex] \sqrt{x + 2y} = z [/tex]

Required:

Solve for y (make y the subject of the formula)

SOLUTION:

[tex] \sqrt{x + 2y} = z [/tex]

Square both sides

[tex] (\sqrt{x + 2y})^2 = z^2 [/tex]

[tex] x + 2y = z^2 [/tex]

Subtract both sides by x

[tex] 2y = z^2 - x [/tex]

Divide both sides by 2

[tex] y = \frac{z^2 - x}{2} [/tex]