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The operation ⭕️ is defined by x ⭕️ y=$$\frac{1}{x}$$+$$\frac{1}{y}$$ for all positive numbers x and y. Which of the following statements must be true for all positive numbers m and r?

Indicate all such statements.
In the xy-plane, S is the set of all points (c, d) for which c and d are both integers.

Quantity A

The number of points in S that are a distance of 2 units from the point (7, 5)

Quantity B

4


Set A={x, y, w}

Set B={x+6, y+6, w+6}

Quantity A

The standard deviation of all the numbers in Set A

Quantity B

The standard deviation of all the numbers in Set B


Quantity A

100!

Quantity B

$$(50!)^{2}$$


x is an odd integer, and y is a multiple of x. Which of the following must be an even integer?
It cost a certain business a total of $4,050.00 to make and sell 4,500 widgets. If the business sold each of the 4,500 widgets for $2.40, what was the business's profit per widget? (Profit is equal to the selling price minus the cost.)
For two statistics classes, class A and class B, there are more students in class A than in class B. The heights of the students in both classes were measured.

Which of the following statements individually provide(s) sufficient additional information to conclude that the average(arithmetic mean)height of the students in class A is greater than the average height of the students in class B?

Indicate all such statements.
The primary purpose of the passage is to
The circumference of circle C is equal to the perimeter of square S.

Quantity A

The ratio of the area enclosed by C to the area enclosed by S

Quantity B

1


Each time a certain coin is tossed, it lands either heads up or tails up. The coin has the property that the probability that it will land heads up when tossed 1 time is 0.6. If the coin is to be tossed 3 times, what is the probability that it will land heads up at least 2 times?


The daily high temperature, in degrees Fahrenheit, in a certain city were recorded for 11 consecutive days. The table above shows the frequency distribution of the recorded temperatures. Which of the following statements are true?

Indicate all such statements.
In 1970 approximately what percent of United States residents were older than 5 but younger than 65 years old?
Of the 10 selected years, which had the greatest total number of United States residents in the combined age groups of "5 years and younger" and "65 years and older"?
Of the following which best describes how the number of United States residents that were in the age-group"5 years and younger"changed from 1900 to 1940?
For all integers $$x$$ and $$y$$, the operation $$▽$$ is defined as $$x▽y=x$$ if $$xy$$ is even, and $$x▽y=-y$$ if $$xy$$ is odd. What is the value of $$(-57▽68)▽(-81)$$?
Because wildfires are becoming increasingly ____________, the computer modeling programs that used to help predict their progression based on information about past fires are becoming less useful to those engaged in fighting the blazes.
If $$1 \leq x \leq 4$$ and $$-3 \leq y \leq 2$$, what is the least possible value of $$x^{-2} +y^{-2}$$?
The primary purpose of the passage is to
Unlike some of her colleagues, the well-known investor (i)___________ large, established companies, instead preferring companies in(ii)_____________ stage of development.
It can be inferred from the passage that toward the end of the Middle Ming period

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