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DaniilM [7]
2 years ago
10

Will mark brainliest (NO LINKS OR ANSWERS WITHOUT EXPLANATION)

Mathematics
2 answers:
Ilia_Sergeevich [38]2 years ago
6 0

Answer: i think the answer is 6x2−xy−35y2

LenKa [72]2 years ago
3 0

Answer:

  6x² -xy -35y²

Step-by-step explanation:

Use the distributive property, and combine terms.

  (2x +5y)(3x -7y) -2xy

  = 2x(3x -7y) +5y(3x -7y) -2xy

  = 6x² -14xy +15xy -35y² -2xy

  = 6x² +(-14 +15 -2)xy -35y²

  = 6x² -xy -35y²

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Jeff is 5 feet tall and casts a shadow 30 inches long. How tall is Marisol if her shadow is 24 inches long?
Westkost [7]
The answer to your problem is that Marisol’s shadow would be 144 feet long
4 0
3 years ago
Read 2 more answers
Simplify 5/6i please help
Leni [432]

Answer:

5/6 can´t be simplified

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
Rephrase in contrapositive form:
miv72 [106K]

Step-by-step explanation:

Consider the provided information.

For the condition statement p \rightarrow q or equivalent "If p then q"

The rule for Contrapositive is: Negative both statements and interchange them. \sim q \rightarrow \sim p

Part (A) If you are taller than 6 ft, then it is unpleasant for you to travel in economy class.

Here p is "you are taller than 6 ft, and q is "it is unpleasant for you to travel in economy class".

It is given that Your contrapositive must not contain explicit references to negation. Assume that the negation of "unpleasant" is "pleasant".

Contrapositive: If it is pleasant for you to travel in economy class then you are not taller than 6 ft then.

Part (B) "If x ≥ 0 and y ≥ 0 then xy ≥ 0" where x, y are real numbers.

Here p is "xy≥ 0, and q is "x ≥ 0 and y ≥ 0"

The negative of xy≥ 0 is xy<0, x ≥ 0 is x<0 and y ≥ 0 is y<0.

Remember negative means opposite.

Contrapositive: If xy < 0 then x<0 and y<0.

8 0
2 years ago
The test scores on a 100-point test were recorded for 20 students:71 93 91 86 7573 86 82 76 5784 89 67 62 7277 68 65 75 84a. Can
Dafna11 [192]

Answer: a. Yes

              b. mean = 76.65

                  standard deviation = 10.04

              c. 76.65 ± 4.4

Step-by-step explanation:

a. <u>Stem</u> <u>and</u> <u>leaf</u> <u>Plot</u> shows the frequencies with which classes of value occur. To create this plot, we divide the set of numbers into 2 columns: <u>stem</u>, the left column, which contains the tens digits; <u>leaf</u>, the right column, which contains the unit digits.

<u>Normal</u> <u>distribution</u> is a type of distribution: it's a bell-shaped, symmetrical, unimodal distribution.

A stem and leaf plot displays the main features of the distribution. If turned on its side, we can see the shape of the data.

The figure below shows the stem and leaf plot of the 100-point test score. As we can see, when turned, the plot resembles bell-shaped distribution. So, this test scores were selected from a normal population.

b. <u>Mean</u> is the average number of a data set. It is calculated as the sum of all the data divided by the quantity the sample has:

mean = \frac{\Sigma x}{n}

For the 100-point test score:

mean = \frac{71+93+91+...+65+75+84}{20}

mean = 76.65

<u>Standard</u> <u>Deviation</u> determines how much the data is dispersed from the mean. It is calculated as:

s=\sqrt{\frac{\Sigma (x-mean)^{2}}{n-1} }

For the 100-point test score:

s=\sqrt{\frac{[(71-76.65)+(93-76.65)+...+(84-76.65)]^{2}}{20-1} }

s = 10.04

The mean and standard deviation of the scores are 76.65 and 10.04, respectively.

c. <u>Confidence</u> <u>Interval</u> is a range of values we are confident the real mean lies.

The calculations for the confidence interval is

mean ± z\frac{s}{\sqrt{n} }

where

z is the z-score for the 95% confidence interval, which is equal 1.96

Calculating interval

76.65 ± 1.96.\frac{10.04}{\sqrt{20} }

76.65 ± 4.4

The 95% confidence interval for the average test score in the population of students is between 72.25 and 81.05.

7 0
2 years ago
Discount tickets to a basketball tournament sell for $4.00 each. Sam spent $60.00 on discount tickets, $37.50 less than if he ha
nignag [31]

Answer: the regular price is $6.5 each.

Step-by-step explanation:

Let x represent the regular price of a ticket to a basketball tournament.

Discount tickets to a basketball tournament sell for $4.00 each. Sam spent $60.00 on discount tickets. This means that the number of tickets that Sam bought is

60/4 = 15 tickets

The cost of 15 tickets at the regular price is 15x

Since the amount he paid is $37.5 lesser than what he would have paid if he bought the tickets at the regular price, then

15x = 60 + 37.5 = 97.5

x = 97.5/15

x = 6.5

5 0
3 years ago
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