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November 13, 2024

Algebra

The solution to the equation X^3 - X^0 = 26 is X = 3.

November 13, 2024

Pre-Algebra

24 is 60 percent of 40.

November 12, 2024

Linear-Algebra

The determinant of the given 4x4 matrix is calculated using cofactor expansion along the fourth row, resulting in a determinant of -21.

November 12, 2024

Linear-Algebra

The determinant of the 2x2 matrix [[2, 2], [3, 5]] is calculated as (2 * 5) - (2 * 3) = 4.

November 12, 2024

Algebra

The equation (x-1)^(|x|-4) = 1 has solutions x = -4, 0, 2, and 4.

November 12, 2024

Pre-Algebra

The difference of squares formula is used to evaluate the expression 100^2 - 99^2, resulting in 199.

November 11, 2024

Pre-Algebra

To find the smallest possible values for A and B in a 10-digit number divisible by both 8 and 9, the last three digits (9B8) must be divisible by 8, and the sum of all digits must be divisible by 9. This leads to B=2 and A=3 as the smallest possible values.

November 11, 2024

Algebra

The equation x^2 - 2x = 0 has two solutions, x = 0 and x = 2, not just x = 2.

November 9, 2024

Algebra

The solution for b in the equation 2^(b^2+2) = 64 is b = 2.

November 9, 2024

Pre-Algebra

To find 2^(m+n), solve for m and n in the equations 2^m = 1 and 2^n = 16, then substitute the values into the expression.

November 7, 2024

Pre-Algebra

The expression 0^0 is considered an indeterminate form in calculus because different approaches to evaluating it yield different potential values. While some approaches suggest a value of 1 and others suggest 0, the limit does not have a single, well-defined value. In some contexts, like combinatorics, it is defined as 1 for convenience.

November 6, 2024

Pre-Algebra

The magnitude of the given row vector is calculated, resulting in 3.

November 6, 2024

Linear-Algebra

The determinant of the 3x3 matrix is calculated using the formula a(ei - fh) - b(di - fg) + c(dh - eg), resulting in a determinant of 0.

November 6, 2024

Algebra

The multiplication of the two given matrices results in a 2x3 matrix with entries calculated by multiplying corresponding rows and columns of the matrices and summing the products.

November 6, 2024

Pre-Algebra

The provided document details the simplification of algebraic fractions and the solution of algebraic expressions. Part 1 simplifies various rational expressions by factoring the numerators and denominators, canceling common factors. Part 2 involves adding, subtracting, and multiplying rational expressions, often requiring finding common denominators and simplifying the resulting expressions.

November 6, 2024

Pre-Algebra

The equation 3^x - 2^x = 65 has a solution at x = 4.

November 5, 2024

Algebra

The equation x^x + 6/x = 7 has two solutions, x = 1 and x = 2, as demonstrated by direct substitution.

November 5, 2024

Geometry

The unknown angle is 50 degrees.

November 5, 2024

Algebra

The solution to the equation 3^(x+2) = 2^(x+3) is found by taking the natural logarithm of both sides, applying logarithm properties, isolating x, and simplifying to an expression involving natural logarithms of 2 and 3. The approximate value of x is then calculated.

November 4, 2024

Algebra

The expression $((i+1)(i-1))^2$ simplifies to 4.

November 4, 2024

Pre-Algebra

The solution to the problem \sqrt{25\%} + \sqrt{49\%} is 1.2, which is equivalent to 120%.

November 3, 2024

Geometry

To find x, the exterior angle theorem is used, along with the knowledge that a right angle is 90 degrees, to solve for x, which equals 45 degrees.

November 3, 2024

Pre-Algebra

The solution to the equation involving radicals and exponents is x = 77/120.

November 3, 2024

Word-Problem

The water lily takes 47 days to cover half the pond, given that it doubles in size each day and covers the entire pond on day 48.

October 31, 2024

Algebra

The equation 3^(x^2)/9^x = 81 is solved by rewriting the equation with the same base, simplifying the denominator, applying the quotient rule for exponents, equating the exponents, rearranging into a quadratic equation, and finally using the quadratic formula to find the two solutions, x = 1 + √5 and x = 1 - √5.

October 31, 2024

Geometry

The unknown angle in a triangle, formed by two slanted lines and a vertical line, with two given angles of 80 degrees each, is calculated to be 20 degrees using the triangle angle sum property.

October 31, 2024

Algebra

The equation x^2 + 3x + 7 = 6/(x^2 + 3x + 2) is solved by substituting u = x^2 + 3x, resulting in a quadratic equation in u. Factoring the quadratic equation yields two possible values for u, which are then substituted back into the substitution to find the solutions for x using the quadratic formula. One case results in two real solutions, while the other yields no real solutions.

October 30, 2024

Algebra

The solution to the equation \sqrt{7 + \frac{3}{\sqrt{x}}} = 7 - \frac{9}{x} is x = \frac{9}{4}.

October 30, 2024

Algebra

The solution involves finding an expression for X_n, a sum of reciprocals of powers of x, using the formula for a finite geometric series. Then, the expression for x^n is used to simplify the ratio x^n / X_n, ultimately resulting in x^(n+1).

October 30, 2024

Geometry

To find x, supplementary angles 5x and 4x are used, along with the fact that the sum of the interior angles of a quadrilateral is 360 degrees. Solving the equation 9x = 180 yields x = 20.