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DedPeter [7]
3 years ago
7

Sabah has $450 to pay for college textbooks. She expects to pay about $75 per book.

Mathematics
1 answer:
gladu [14]3 years ago
4 0

Answer:.

75(b - 4) = 450

Step-by-step explanation:

Given that :

Total amount to spend on books = 450

Total number of books = b

Cost per book = 75

Number of free books = 4

Hence, the number of books sabah will have to pay for will be :

Total Number of books - number of free books

b - 4

Cost of books purchased will be ;

Cost per book * number of books ;

75 * (b - 4)

Total cost = 450

Hence, we have ;

75(b - 4) = 450

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The present age of Madison is <u>1027 years</u> and that of his mother is <u>3080 years</u> (rounded off to nearest whole numbers), solved using the linear equation in one variable: <u>(x + 614) + (3x + 614) = 5334</u>, where x represents the present age of Madison.

<h3>What are linear equations in one variable?</h3>

Linear equations in one variable are the linear relationship between two algebraic expressions not involving more than one variable throughout the equation.

<h3>How to solve the question?</h3>

In the question, we are informed that the present age of Maison's mother is 3 times that of Madison. After 614 years, the sum of their age will be 5334 years.

We are asked to determine their present ages.


We assume the present age of Madison to be x years.

Therefore, the present age of Madison's mother = 3x years {3 times that of Madison}.

Now, after 614 years, both of their ages will increase by 614 years.

Therefore, age of Madison after 614 years = x + 614 {Present + 614}.

Age of Madison's mother = 3x + 614 {Present + 614}.

We are given that after 614 years, the sum of their ages will be 5334.

This can be represented by the linear equation in one variable:

(x + 614) + (3x + 614) = 5334

This linear equation in one variable can be simplified and solved in the following way:

or, 4x + 1228 = 5334 {Simplifying},

or, 4x + 1228 - 1228 = 5334 - 1228 {Subtracting 1228 from both sides}

or, 4x = 4106 {Simplifying}

or, 4x/4 = 4106/4 {Dividing both sides by 4},

or, x = 1026.5 {Simplifying}.

Therefore, the present age of Madison = x = 1026.5 = 1027 years (nearest whole number).

The present age of Madison's mother = 3x = 3*1026.5 = 3079.5 = 3080 years (nearest whole number).

Learn more about linear equations in one variable at

brainly.com/question/185288

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