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Algebra

The use of letters to substitute unknown numbers to form an equation. Solve the equation to get the unknown number using different methods such as simultaneous equations and more.

227,579 Questions

What is a Perfect square between 150 and 250?

A perfect square is a number that can be expressed as the product of an integer multiplied by itself. To find a perfect square between 150 and 250, we need to determine the square root of the upper and lower bounds. The square root of 150 is approximately 12.25, and the square root of 250 is approximately 15.81. Therefore, the perfect square between 150 and 250 is 169, which is 13 squared.

What is a equivalent ratio to 12 24?

Oh, what a happy little question! If we want to find an equivalent ratio to 12:24, we can simplify it by dividing both numbers by their greatest common factor, which is 12. So, 12 divided by 12 is 1, and 24 divided by 12 is 2. Therefore, an equivalent ratio to 12:24 is 1:2. Just like painting, math can be a beautiful masterpiece when we simplify it with gentle brushstrokes.

What is the LCM and GCF of 30 and 40 and 60?

Oh, dude, you're hitting me with the math questions? Okay, okay, let's see. The LCM of 30, 40, and 60 is 120 because that's the smallest number they can all be divided evenly by. The GCF of those numbers is 10 because it's the largest number that can divide all three of them without leaving a remainder. Math, man, it's like magic but with numbers.

How long would it take to travel 1420 miles?

It depends on how fast you would go. Let's pretend you traveled on the average speed of a highway (65 mph).

Use the equation: rate x time = distance.

Then solve for time: time = distance/rate

Set it up: time = 1420 miles/65 mph

It would take 21.8 hours.

What is the volume of a cylinder that has a radius of 8 cm and a height of 20 cm?

Oh, what a delightful question! To find the volume of a cylinder, you can use the formula V = πr^2h, where r is the radius and h is the height. Plugging in the values, we get V = π(8 cm)^2(20 cm) = 1280π cm^3. So, the volume of the cylinder is 1280π cubic centimeters. Isn't that just lovely?

How many digits are between 1 and 238?

There are 238 - 1 = 237 numbers between 1 and 238. To find the number of digits, we need to consider the range of numbers from 1 to 9 (1-digit numbers), 10 to 99 (2-digit numbers), and 100 to 238 (3-digit numbers). There are 9 one-digit numbers, 90 two-digit numbers, and 139 three-digit numbers between 1 and 238, totaling 9 + 90 + 139 = 238 digits.

What is the ratio of 36 to 144?

Well, isn't that just a happy little question! The ratio of 36 to 144 can be simplified by dividing both numbers by their greatest common factor, which is 36. So, 36 divided by 36 is 1, and 144 divided by 36 is 4. Therefore, the ratio of 36 to 144 is 1:4. Just remember, there are no mistakes in ratios, just happy little simplifications!

What is the answer to page 8.7 Punchline Algebra book A what do you call a cow that never gives milk?

The answer to the joke on page 8.7 of the Punchline Algebra book A is a "milk dud." This is a play on words, combining the concept of a cow that never gives milk with the candy "Milk Duds," creating a humorous pun.

What are the answers to page 17.6 for punchline algebra book a worksheet?

I'm sorry, but I cannot provide specific answers to a worksheet as it goes against academic integrity and ethical standards. However, I can guide you on how to solve the problems on page 17.6 of the Punchline Algebra Book A worksheet. If you have specific questions or need help understanding a concept, please feel free to ask, and I'd be happy to assist you in working through the problems.

What is an eigenvector?

Given some matrix A, an eigenvector of A is a vector that, when acted on by A, will result in a scalar multiple of itself, i.e. Ax=[lambda]x, where lambda is a real scalar multiple, called an eigenvalue, and x is the eigenvector described.

To find x you will normally have to find lambda first, which means solving the "characteristic equation": det(A-[lambda]I)=0, where I is the identity matrix.

The derivation of the "characteristic equation" is as follows:

Rearrange the equation Ax=[lambda]x -> Ax-[lambda]x=0 -> (A-[lambda]I)x=0 and then use the property from linear algebra that says if (A-[lambda]x) has an inverse, then x=0. Since this is trivial, we must instead prove that (A-[lambda]x) does not have an inverse. Because the inverse of a matrix is equal to its transpose divided by its determinant, and because you can't divide by 0, a 0 valued determinant means that the inverse can't exist. This is why we must solve det(A-[lambda]I)=0 for lambda.

Once we have found lambda, we can put it in the equation Ax=[lambda]x, and it's then just a simple matter of solving the resulting linear equations.

What is the diameter of a circle with a circumference of 62.83185?

To find the diameter of a circle when given the circumference, you can use the formula: diameter = circumference / π. In this case, the circumference is 62.83185. So, the diameter would be 62.83185 / π ≈ 20 units.

What is 130 round to the nearest ten?

When rounding 130 to the nearest ten, you look at the digit in the tens place, which is 3. Since 3 is less than 5, you round down. Therefore, 130 rounded to the nearest ten is 130.

What is is the length and width of 200 square meters?

First of all, there is no reason to assume, from the question, that the area is in the form of a rectangle.

Even if it were, the length can have any value greater than or equal to sqrt(200) = 14.14 m (approx)

Let L be any number greater than or equal to 14.14

and let W = 200/L

Then the area L*W = L*200/L = 200

and since there are an infinite number of possible values of L, there are infinitely many possible answers to the question.

What is radius of a 8.7 cm circle?

Oh, dude, the radius of a circle is just the distance from the center to any point on the circle. So, if you have an 8.7 cm circle, the radius is half of that, which is 4.35 cm. Like, it's just basic math, nothing too crazy.

How many four digits numbers can be made with 1 4 5 9 without repetition?

To calculate the number of four-digit numbers that can be made using the digits 1, 4, 5, and 9 without repetition, we use the permutation formula. Since there are 4 digits to choose from for the first digit, 3 for the second, 2 for the third, and 1 for the fourth, the total number of permutations is 4 x 3 x 2 x 1 = 24. Therefore, there are 24 different four-digit numbers that can be formed using the digits 1, 4, 5, and 9 without repetition.

What are the steps in solving product of sum and difference of two terms?

Add the two given numbers together.

Subtract the two given numbers.

Take the answer to each of these and multiply them together.

For example, if your two given numbers are 8 and 10:

Add them together and you get 18

Subtract them and get 2

Then multiply 2 x 18 and get 36

The quotient of 45 and the sum of c and 17?

The expression for the quotient of 45 and the sum of c and 17 is 45 / (c + 17). This expression represents the result of dividing 45 by the sum of c and 17. To simplify this expression further, you would need a specific value for c to calculate the exact quotient.

A square has an area of 25 yard what is the perimeter of the square?

To find the perimeter of a square when given the area, you first need to calculate the length of one side of the square. Since the area of the square is 25 square yards, the length of one side can be found by taking the square root of the area, which in this case is 5 yards. The perimeter of a square is calculated by multiplying the length of one side by 4, so the perimeter of this square would be 5 yards x 4 = 20 yards.

What is angle if sin equals 0.99?

If the sine of an angle is 0.99, then the angle is approximately 84.3 degrees. This is because the sine function gives the ratio of the length of the side opposite the angle to the length of the hypotenuse in a right triangle. In this case, the opposite side is much longer than the hypotenuse, indicating a steep angle close to 90 degrees.

What numbers have a mean of 7?

To find numbers with a mean of 7, we need to consider the sum of the numbers and the total count of numbers. If we have two numbers, they must add up to 14 to have a mean of 7. For three numbers, their sum must be 21. In general, any set of numbers that sum up to 7 times the count of numbers will have a mean of 7.

What is 1.66666667 in fraction form?

1.66666667 in fraction form is 5/3. This can be simplified by dividing both the numerator and denominator by their greatest common factor, which in this case is 1. Therefore, 5/3 is the simplest fraction representation of 1.66666667.

Which figure has 4 pairs of parallel lines and 8 obtuse angles?

The figure that has 4 pairs of parallel lines and 8 obtuse angles is a rectangular shape known as a rhombus. A rhombus is a quadrilateral with all sides of equal length and opposite angles of equal measure. In a rhombus, each pair of opposite sides are parallel to each other, resulting in 4 pairs of parallel lines. Additionally, since a rhombus has 4 angles greater than 90 degrees, it will have a total of 8 obtuse angles.

What is the square root of x to the fourth power?

Well, darling, the square root of x to the fourth power is simply x squared. It's like asking how many slices of cheesecake you can fit in your mouth at once - the answer is two, unless you're feeling extra ambitious. Just remember, math may be complex, but dessert is always a simple pleasure.

What is 3p over 5p in simplest form?

Oh, what a happy little question! To simplify 3p over 5p, we can cancel out the p in the numerator and denominator, leaving us with 3 over 5. It's just like painting a beautiful landscape - sometimes we need to simplify our colors to create a harmonious picture.