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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

If 15x equals 360 then x equals?

15x = 360

Algebrauically rearrange

x = 360/15

Cancel down by '5'

x = 72/3

Cancel down by '3'

x = 24/1

x = 24 The answer!!!!!

0.25 x 360 equals?

0.25 X 360 = 90

To mulyply decimals by long multiplication.

360

x 25 ( NB we have temporarily dropped the decimal point).


7200 (360 x 20)

1800 (360 x 5)


9000

=====

We note that there were only 2 decimals places in the multiplicands. So the answer has 2 decimal places.

Hence 9000 becomes , 90,00 or just plain '90'.

Another way is to note that ' 0.25 = 1/4'

So again multiply 360 x 1/4

Multiplication of fractions.

360/1 x 1/4 =

Cancel down by '4'

90/1 X 1/1 = 90/1 = 90

Another 'Short Circuit' method. is to note that 9 x 4 = 36

Hence 90 x 4 = 360

So 360/ 4 - 360 x 1/4 = 90 .

Careful with this last method, 'Short Circuits; can be dangerous, mabd so you my end up with the wrong answer.

What does 90 x 12 equals?

By long multiplication

90

x 12


900

180


1080

===== Done!!!!!

What is the nth term in the sequence 1 7 13 19?

Appears we are adding 6 each time. So the nth term is a_(n-1)+6 where n-1 is a subscript of a.

What is the function of rDNA?

rDNA, or ribosomal DNA, encodes the RNA components of ribosomes, which are essential for protein synthesis in all living cells. It is involved in the production of ribosomal RNA (rRNA), a critical component of ribosomes, and plays a key role in the assembly of ribosomal subunits. Additionally, rDNA is often used as a molecular marker in genetic studies due to its repetitive nature and evolutionary significance.

How do I reflect the graph of f(x)x-1 across the y axis and then translate it 4 units down?

To reflect the graph of ( f(x) = x - 1 ) across the y-axis, you replace ( x ) with ( -x ), resulting in the equation ( f(-x) = -x - 1 ). To translate this graph 4 units down, you subtract 4 from the entire function, giving you ( f(-x) - 4 = -x - 1 - 4 = -x - 5 ). Thus, the final transformed function is ( f(-x) - 4 = -x - 5 ).

What is the graph for 4x plus 3y is less then or equal to 24?

The graph of the inequality (4x + 3y \leq 24) represents a region in the coordinate plane. First, you would graph the line (4x + 3y = 24) by finding the x-intercept (6,0) and y-intercept (0,8). The area below this line, including the line itself, is the solution to the inequality, indicating all the points ((x, y)) that satisfy (4x + 3y) being less than or equal to 24.

How do you find the domain and range of f ( x ) x 2 1?

To find the domain of the function ( f(x) = x^2 + 1 ), we identify the set of all possible input values for ( x ). Since this is a polynomial function, the domain is all real numbers, expressed as ( (-\infty, \infty) ). The range is determined by analyzing the output values; the minimum value of ( f(x) ) occurs at ( x = 0 ), giving ( f(0) = 1 ). Therefore, the range is ( [1, \infty) ).

Evaluate 67s for s 8 In Algebra When s 8 67s 3?

It seems there might be a typo or confusion in your question. If you meant to say "Evaluate 67s for s = 8," then substituting s with 8 gives you 67 * 8 = 536. If "67s 3" refers to something else, please clarify for more accurate assistance.

What is 8.99 x 4?

8.99 multiplied by 4 equals 35.96. You can calculate this by multiplying the two numbers directly.

What is the expected value of x?

The expected value of a random variable ( x ) is a measure of the central tendency and is calculated as the weighted average of all possible values, where each value is weighted by its probability of occurrence. Mathematically, it is expressed as ( E(x) = \sum (x_i \cdot P(x_i)) ) for discrete variables, or as ( E(x) = \int x \cdot f(x) , dx ) for continuous variables, where ( f(x) ) is the probability density function. The expected value provides insight into the long-term average outcome of a random variable in a probability distribution.

What is the function of a nematocyts?

Nematocysts are specialized stinging cells found in cnidarians, such as jellyfish, sea anemones, and corals. Their primary function is to capture prey and provide defense against predators. When triggered, nematocysts release a coiled thread that can inject toxins into the target, immobilizing or harming it. This mechanism is essential for the survival and feeding of these marine organisms.

Why is cos (x) sin (90-x) for x such that 0 x 90?

The identity (\cos(x) = \sin(90^\circ - x)) arises from the co-function relationship in trigonometry. For angles in the range (0^\circ \leq x \leq 90^\circ), the sine of an angle is equal to the cosine of its complementary angle. Thus, when you replace (90^\circ - x) with (x) in the sine function, you obtain (\cos(x)). This relationship highlights the symmetry of the sine and cosine functions in a right triangle.

Does the residual plot show that the line of best fit is appropriate for the data?

To determine if the line of best fit is appropriate for the data, examine the residual plot for randomness. If the residuals are randomly scattered around the horizontal axis without any discernible pattern, it suggests that the linear model is suitable. Conversely, if the residuals display a pattern (such as a curve), it indicates that a linear model may not be the best fit for the data.

What is 16 x2?

16 x 2 equals 32. This is a simple multiplication problem where you double the number 16. Therefore, the final answer is 32.

How do you find the quotient of a binomial or polynomial when it has a remainder?

To find the quotient of a binomial or polynomial when there is a remainder, perform polynomial long division or synthetic division. Divide the leading term of the dividend by the leading term of the divisor to get the first term of the quotient. Multiply the entire divisor by this term and subtract the result from the dividend, bringing down the next term as needed. Continue this process until you reach a remainder that is of lower degree than the divisor, which can be expressed as ( \text{Quotient} + \frac{\text{Remainder}}{\text{Divisor}} ).

How are the coordinates of a point affected by a reflection of the point over the x-axis?

When a point with coordinates ((x, y)) is reflected over the x-axis, its x-coordinate remains the same while the y-coordinate changes sign. Thus, the new coordinates of the reflected point become ((x, -y)). This transformation effectively flips the point vertically, moving it to the opposite side of the x-axis.

What is the y- intercept of the line and what doe it represent?

The y-intercept of a line is the point where the line crosses the y-axis, represented by the coordinate (0, b), where b is the value of the y-intercept. It indicates the value of the dependent variable when the independent variable is zero. In practical terms, the y-intercept often represents the starting point or initial value of a scenario described by the line's equation, such as the initial amount of money in a bank account before any deposits or withdrawals.

When did algebra first originate?

Algebra originated in ancient civilizations, with its roots tracing back to around 2000 BCE in Babylon, where early forms of algebraic concepts were used for solving equations related to land measurement and trade. However, the term "algebra" itself is derived from the Arabic word "al-jabr," which was popularized by the mathematician Al-Khwarizmi in his 9th-century work, "Al-Kitab al-Mukhtasar fi Hisab al-Jabr wal-Muqabala." This book laid the foundations for modern algebra by systematically solving linear and quadratic equations. Thus, while the foundations of algebra date back millennia, its formalization as a discipline began in the medieval Islamic period.

What are the function of frontispiece?

A frontispiece serves various functions in a book, primarily as a decorative illustration or a visual representation of the work's theme. It often includes the title, author’s name, and sometimes an image or symbol that encapsulates the book's essence. Additionally, it sets the tone for the reader and can enhance the overall aesthetic appeal of the publication. In some cases, it also provides context or background information relevant to the content that follows.

What Given the following function choose the graph with the two possible angles with the domain 0 360. cos?

To find the angles where ( \cos(\theta) ) has specific values within the domain of ( 0^\circ ) to ( 360^\circ ), you would typically identify the corresponding reference angle and then consider both the first and fourth quadrants for positive values, and the second and third quadrants for negative values. For example, if you are looking for ( \cos(\theta) = 0.5 ), the angles would be ( 60^\circ ) and ( 300^\circ ). If you provide a specific cosine value, I can give you the exact angles.

How do we solve- equations with the variable on both sides of the equal sign?

To solve equations with variables on both sides, first isolate the variable by moving all terms involving the variable to one side of the equation and constant terms to the other side. This can be done by adding or subtracting terms as necessary. Once the variable is isolated, simplify the equation if needed and solve for the variable. Finally, check your solution by substituting it back into the original equation.

What phrases describe an unknown or changeable quanity?

Phrases that describe an unknown or changeable quantity include "variable," "unknown value," "indeterminate amount," and "flexible figure." Terms like "x" or "y" in mathematical contexts represent such quantities. Additionally, phrases like "subject to change" or "estimated value" convey the idea of uncertainty or variability.

What are the different factoring methods?

There are several factoring methods, including:

  1. Greatest Common Factor (GCF): This involves finding the largest factor shared by all terms in a polynomial.
  2. Grouping: This method groups terms with common factors and factors them separately.
  3. Difference of Squares: This applies when a polynomial can be expressed as the difference between two squares, allowing for the use of the formula (a^2 - b^2 = (a - b)(a + b)).
  4. Quadratic Trinomials: This method factors trinomials of the form (ax^2 + bx + c) into binomials, often using techniques like trial and error or the quadratic formula.