I need an equation example with an unknown factor?

2 answers:

3 0

Lets say, I bought 3 cakes in the store and I spent $300, how much does a cake cost?
The equation representing that situation is the following, calling x the cake cost, our unknown factor:
3x = 300
we can solve this equation by dividing all equation by 3:
x = 100
therefore each cake costs $100

tia_tia [17]3 years ago

3 0

I want to buy eight bracelets, I don't know how much each bracelet costs, but the final cost will be $39.67.
The equation would look like this:
8 x c = 39.67
Where c equals cost.
To find the answer I would do the following:
8 x c = 39.67
c = 39.67 / 8
c ≈ 4.95
Each bracelet costs about $4.95.

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Dalia saved $3000 last year. She said $600 in the month of January. What percent of the total amount of money she saved last yea

Anni [7]

1. We assume, that the number 3000 is 100% - because it's the output value of the task.
2. We assume, that x is the value we are looking for. 
3. If 100% equals 3000, so we can write it down as 100%=3000. 
4. We know, that x% equals 600 of the output value, so we can write it down as x%=600. 
5. Now we have two simple equations:
1) 100%=3000
2) x%=600
where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:
100%/x%=3000/600
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 600 is what percent of 3000

100%/x%=3000/600
(100/x)*x=(3000/600)*x - we multiply both sides of the equation by x
100=5*x - we divide both sides of the equation by (5) to get x
100/5=x 
20=x 
x=20
So 600 is 20% of 3000

7 0

4 years ago

Multiple choice please please answer

lakkis [162]

Answer:

$\purple { \boxed{x = 25 \times \sin \: 39 \degree}}$