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.

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.

7x+91 can be factored to: 7(x+13) Read More

It could be that 144 is a square number because 12*12 = 144 Read More

To the left of 0, between -21 on its left and -19 on its right. Read More

The lengths of the four sides of a quadrilateral do not provide enough information to determine its area. This is because a quadrilateral is not a rigid shape and so can be flexed so as to change its area. For example, if you have a rectangular shape, you can move the top side to the right, say. The rectangle will become a parallelogram and the top will move a little closer to the bottom. You… Read More

You divide each term of the binomial by the monomial, and add everything up. This also works for the division of any polynomial by a monomial. Read More

A single number, such as 8163264, does not form a sequence. Read More

Let the diagonals be x and y:- If: x+y = 21 then y = 21-x If: 0.5xy = 54 then 0.5x(21-x) = 54 => 21x -x squared -108 = 0 Solving the above quadratic equation: x = 12 or x = 9 The rhombus will then consist of 4 right angle triangles with base 4.5 and height 6 Using Pythagoras' theorem their hypotenuses are 7.5 cm Perimeter: 4*7.5 = 30 cm Read More

This doesn't work as written. There is no positive number solution for x. If that was square instead of square root, you could use 4. Read More

It is: 1320 because 1320 times 1320 = 1742400 Read More

the slope = (y - y1)/(x - x1). Accordingly, -3 = (y - 8)/(x - 7). The result is -3x + 21 = y - 8 or y = 29 - 3x Read More

It is: nth term = 5-4n and so the next term will be -19 Read More

Let the other diagonal be x:- If: 0.5*x*12 = 54 Then: x = 54/6 => 9 The rhombus will consist of 4 right angles: base 4.5 cm and height 6 cm Using Pythagoras: hypotenuses = 7.5 cm Therefore perimeter: 4*7.5 = 30 cm Read More

The circumference of a circle with a 51 foot radius is 320.4 ft, approx. Read More

Greatest 2 digit positive number is 99 and adding 1 to it will yield 99 + 1 = 100 Read More

Thirteen (13) is the sum of all of the common factors of 27 and 63. Read More

It is an irrational number and lies between 6 and 7 Read More

Unfortunately, the browser used by Answers.com for posting questions is incapable of accepting mathematical symbols. This means that we cannot see the mathematically critical parts of the question. We are, therefore unable to determine what exactly the question is about and so cannot give a proper answer to your question. However, I suspect that the answer is in the negative. Read More

There are very many ways which depend on the level of your mathematical sophistication. slope intercept form: y = mx + c two point form: (y2 - y1)/(x2 - x1) = (y - y1)/(x - x1) where x2 is not equal to x1 standard form: ax + by + c = 0 [this form can be extended to lines in spaces with 3 or more dimensions] r*sin(theta) = r*m*cos(theta) + c There are also several… Read More

It would probably refer to a digit that is a prime number, or a composite number. Note that mathematicians normally talk about prime and composite NUMBERS, not individual digits. Read More

It is 1 if the two are the only factors. Read More

Three. Read More

True. Read More

Add them up: 5 + 300 + 8 = 513 I suspect that you may have a zero missing: either: 50 + 300 + 8 = 358 or: 5 + 300 + 80 = 385 Expanded form is usually written with the biggest number first and the rest in decreasing value, ie 358 = 300 + 50 + 8 385 = 300 + 80 + 5 Read More

Let its sides be squared x and squared y:- Using Pythagoras: x+y = 42.25 => y = 42.25-x Area: xy = (10.14*2) squared => x(42.25-x) = 411.2784 S: 42.25x -x^2 -411.2784 = 0 Solving the quadratic equation: x = 15.21 or x = 27.04 Square root of 15.21 = 3.9 and square root of 27.04 = 5.2 When x = 3.9 then y = 5.2 Perimeter of the triangle: 3.9+5.2+6.5 = 15.6 cm Read More

Volume of the sphere: 4/3*pi*4 cubed = 268.083 cubic units rounded to 3 decimal place Read More

It is an algebraic " phrase ", but in not a complete algebraic expression. What does the expression equal? Read More

y = 0x + 3 or just y = 3 Read More

Any equation parallel to the x-axis is of the form:y = constant In this case, you can figure out the constant from the given point. Read More

Unfortunately, the browser used by Answers.com for posting questions is incapable of accepting mathematical symbols. This means that we cannot see the mathematically critical parts of the question. We are, therefore unable to determine what exactly the question is about and so cannot give a proper answer to your question. Please edit your question to include words for symbols and resubmit. Read More

24 - 13x + 5 = 30x + 5 - 3x is the same as 24 - 13x + 5 = 27x + 5 is the same as 29 -13x = 27x + 5 is the same as -13x -27x = 5 -29 is the same as -40x = -24 is the same as 40x = 24 is the same as 5x = 3 Read More

I suppose you could add them all up, but here's the same formula written differently. Given two numbers A and B where B is greater than A, the sum of values between A and B inclusive is given by: (B + A)(B - A + 1)/2 57 x 44 = 2508 2508/2 = 1254 Read More

Any value of x that is more than 4, for example 4.000000000000001 Read More

If: 2x+y = 5 then y = 2x-5 If: x^2 -y^2 = 3 then x^2 -(2x-5)^2 = 3 Multiply out the bracket and bringing terms to LHS: -3x^2 -28+20x = 0 Solving the above quadratic equation: x = 14/3 or x = 2 By substitution points of intersection are: (2, 1) and (14/3, -13/3) Read More

x0 and y0 aren't lines. Do you mean x=0 and y=0? If so, they are the y axis and the x axis, respectively, and the answer is 90 degrees as noted above. Read More

Unfortunately, the browser used by Answers.com for posting questions is incapable of accepting mathematical symbols. This means that we cannot see the mathematically critical parts of the question. We are, therefore unable to determine what exactly the question is about and so cannot give a proper answer to your question. Please edit your question to include words for symbols and resubmit. There is no sign between the two terms in the brackets. Read More

One area that comes to mind immediately is that of driving. Knowing the slope of a hill allows the correct gear to be selected for ascending or descending a hill - the latter extremely important for long steep hills going down where lots of use of the brakes could lead to brake fade and so engine braking, through the use of a low gear, would help; with an automatic transmission, a "hold gear" option to… Read More

If x squared equals n, then x is the square root of n. Read More

33 marbles must be in the sixth line Read More

The numbers are 47 and 48. (47 x 48 = 2,256) Read More

It means that there is a function - which is here named with the generic name "g"; it might be any function - and that this function depends on variable "y". Read More

The number is 55. 55 - 13 = 42. Read More

Let the diagonals be x and y:- If: x+y = 24.5 then y = 24.5-x If: 0.5xy = 73.7 then 0.5x(24.5-x) = 73.5 So: 24.5x -x^2 -147 = 0 Solving the quadratic equation: x = 14 or x = 10.5 The rhombus will then consist of 4 right angle triangles of base 5.25 and height 7 Using Pythagoras: 5.25^2+7^2 = 76.5625 and its square root is 8.75 Therefore the perimeter of the rhombus: 4*8.75 =… Read More

Equation: 10x^2 -29x +10 = 0 When factored: (2x-5)(5x-2) = 0 Its solutions: x = 5/2 or x = 2/5 Read More

Neither because the circumference of a circle is a measurement of length Read More

If you mean: 144/3 then it is 48 otherwise it is 1/48 Read More

The curved surface area of a cone is: pi*radius*slant length. Read More

I guess you mean something like 2³ (also written as 2^3) Here the little number to the top right is the index or power and it tells you how many times the number is multiplied by itself; with 2³ it means that the 2 is multiplied by itself 3 times, ie 2³ = 2 × 2 × 2 = 8. There are various rules to how to handle the indices. * If a number with… Read More

Overall "on average" it will increase between those points (as the y value of the greater x valued point is greater than the y of the lesser x valued point), but it could be a curve that has sections that increase and other sections that decrease. Read More

A straight horizontal line is a line having no steepness. Read More

1, 2, 5, 10, 25 ,50 (Factors of 150: 1, 2, 3, 5, 6, 10, 15, 25, 30, 50, 75, 150 Factors of 250: 1, 2, 5, 10, 25, 50, 125, 250) Read More

It is a trinomial. The square of (a + b)^2 is a^2 + 2ab + b^2. Read More

Unfortunately, due to the limitations of browsers, most mathematical symbols get removed and it leaves gibberish that is impossible to answer. Please edit/re submit your question with a full sentence of what you want solved, replacing mathematical symbols by words: plus for + equals for = etc. Read More

Unfortunately, due to the limitations of browsers, most mathematical symbols get removed and it has left three terms separated by spaces that is impossible to answer. Please edit/re submit your question with a full sentence of what you want solved, replacing mathematical symbols by words: plus for + equals for = etc Read More