Marcus and his friends are having
a Final Four party. Marcus buys 5
burgers and 9 sodas for $28.75 at
the Beefy Burger joint. When five
more of his friends show up, he
heads back to Beefy Burger for 10
more burgers and 10 more sodas
and spends $47.50.

S = 1.25

B = 3.50

Step-by-step explanation:

I assume you need to know how much a burger and how much a soda is.

Basically it's a system of equations.

5B + 9S = 28.75

10B + 10S = 47.5

There are a few ways to do this, if you like I can show another, but this is how I usually solve a normal system of equations.

First solve for one variable in one equation.  I am going to choose to solve for B in 10B + 10S = 47.5

10B + 10S = 47.5 (divide the whole thing by 10)

B + S = 4.75 (subtract S from both sides)

B = 4.75 - S

Now plug this B into the other equation.

5B + 9S = 28.75

5(4.75 - S) + 9S = 28.75

23.75 - 5S + 9S = 28.75 (Now just solve for S

4S = 5

S = 5/4

S = 1.25

Now plug THIS back into the first one.

B = 4.75 - S

B = 4.75 - 1.25

B = 3.50

distance covered by pamela in 9 l of fuel = 99km

let us apply unitary method here.

distance covered by pamela in 1 l of fuel =99/9 =11 km

now let us find distance covered by pamela if she has 12 l of fuel.

distance covered in 12 l = distance covered in 1 l of fuel * 12

we know that distance covered by here in 1 l is 11 km.

so distance covered in 12 l of fuel = 11*12 = 132 km.

step-by-step explanation:

if you want to solve percent error follow these steps.

1. subtract the accepted value from the experimental value.

2. take the absolute value of step 1.

3. divide that answer by the accepted value.

4. multiply that answer by 100 and add the % symbol to express the answer as a percentage.

if you want to solve percent of change just do this.

1. work out the difference (increase) between the two numbers you are comparing.

2. divide the increase by the original number and multiply the answer by 100. if your answer is a negative number then this is a percentage decrease.

hope this : )