If the area of a rectangle is 320 square feet and the width is 20 feet, what is the length of the rectangle?
2 answers:
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We need to solve the speed formula for d. To do so, let's start by moving the number of the left hand side:
Square both sides to get rid of the square root:
Now plug the known value of the speed to find the distance:
So the closest answer is the last one: d=0.155km
Expression 4 (3n - 5) is equivalent to <em><u>C: 12n - 20</u></em>
<h3>Further explanation </h3>Algebraic expressions in mathematics are a combination of coefficients, numbers, variables, constants and arithmetic operations such as addition, subtraction, multiplication, and division.
The main composition of algebraic expressions are:
- 1. phrases
algebraic forms separated by arithmetic operations
consists of one phrase (monomial) to many phrases (polynomial)
- 2. variable
is a value that can be changed, can be in the form of letters, for example, x, y, a, b, etc.
- 3. constants
is a fixed value, can be a number
- 4. arithmetic operations ⇒ +, - , : , x
Calculation operations include multiply, divide, add, substract, etc.
There are several properties in integer multiplication operations
- 1. closed property
Multiplication between integers will produce integers too
- 2. commutative property
a x b = b x a
- 3. associative property
ax (bxc) = (axb) xc
- 4. identity
ax1 = 1 x a = a
- 5. distributive property
*<em> addition </em>
ax (b + c) = axb + axc
* <em>substraction </em>
ax (b-c) = axb - axc
We can use distributive property of <em>substraction </em>to solve the problem
"Equivalent to" means having the same value.
From the answer choices , which produce the same expression is C. 12n-20
<h3>Learn more </h3>6 squared divided by 2 (3) +4
an algebraic expression
Keywords: PEMDAS, arithmetic operations, multiply, Parentheses, equivalent to
For this case we assume that the photo album is rectangular in shape and therefore the fabric too. By definition, the area of a rectangle is given by:
Where:
a: It is the length of the rectangle
b: It is the width of the rectangle
According to the problem data we have to:
Substituting:
We clear "a":
Thus, the length of the fabric is
ANswer:
The length of the fabric is