During the day,Sam spent $4.85 on lunch.he also bought 2 books for $7.95 each. At the end of the day we had $8.20 left how much money did he start with.

Answer:

25%

Step-by-step explanation:

Initial hourly pay of Mario = $8

Current hourly pay of Mario = $10

Increment = current hourly pay - initial hourly pay = $10-$8 = $2

% increase in hourly pay rate = increment/initial pay × 100$

℅ increase = $2/$8×100%

% increase = 1/4×100%

%increase = 25%

Therefore, percent increase in marios hourly pay rate is 25%

The cost of three books are $4, $8 and $12.

What is linear equation in one variable?

The linear equations in one variable is an equation which is expressed in the form of ax + b = 0, where a and b are two integers, and x is a variable and has only one solution.

According to the given question

We have

Number of books purchased by Drew = 3

Total cost of the three books = $24

Cost of each book is multiple of 4.

Let the cost of three books be 4x, 8x and 12x.

So, we have

A linear equation in one variable

4x + 8x + 12x = 24

⇒ 24 x = 24

⇒ x = 1

Therefore, the cost of three books will be

4x = 4 × 1 = $4

8x = 8 × 1 = $8

12x = 12 × 1 = $12

Learn more about the linear equation in one variable here:

brainly.com/question/17139602

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Answer:

18a + 2b

Step-by-step explanation:

8a - 2b + 12a -2a + 4b​   Add together like terms

(8a + 12a - 2a) + (-2b + 4b) Then add the A's and B's together to get your answer

18a +2b