Below are examples expressions for a variable. I need to explain my problem and answer just like the examples below, please give me a few problems to explain just like the samples below thanks...
A mathematical expression is similar to a phrase or fragment of a sentence. An expression has no subject and no verb or relation symbol such as '=' (is equal to) or '<' (is less than) or '>' (is greater than)
Four smaller than a number ... n - 4
Five times a number ... 5n = 5 ? n = 5 (n) = (5) (n)
We cannot solve an expression for a variable. If we are given a value to substitute for the variable, we can simplify or evaluate the expression.
Substitute 13 for 'n' and simplify or evaluate the expressions.
n - 4 = 13 - 4 = 9
5n = 5 g 13 = 65
An equation is similar to a complete sentence. It has a subject and verb, and is a complete idea. Mathematical sentences or statements are called equations (=) and inequalities (<, £, >, ³). The relation symbols are the verbs of the sentences.
Ten is six less than a number ... 10 = n - 6
Seven times a number is equal to twenty-eight ... 7n = 28
We can solve an equation for a variable ... finding the numerical value that makes the sentence or equation a true statement.
Solve for n: 10 = n - 6
10 = n - 6 ... We always write the original problem when we start
n = 10 + 6
n = 16 ... This means that n = 16 makes the original equation a true statement
10 = n - 6
10 = 16 - 6
10 = 10 ... True Statement
Solve for n: 7n = 28
7n = 28
n = 28 ¸ 7
n = 4 ... This means that n = 4 makes the original equation a true statement
7n = 28
7 g 4 = 28
28 = 28 ... True Statement
1. Write mathematical expressions for following phrases:
(a) Five more than a number
(b) Eight times a number
(c) Six less than seven times a number
(d) Five more than eleven times a ...
This solution is comprised of a detailed explanation to solve problems.