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So for this we will be using a system of equations, with one equation representing Shakira's sales and the other representing Jeff's sales. Our equations are such (Let x = oranges and y = grapefruit)
For this, I will be using the elimination method. So firstly, multiply both sides of the second equation by -4:
Next, add 5x+8y=235 and -12x-8y=-340 to get -7x = -105 . From here we can solve for x.
For this, just divide both sides by -7, and your answer is going to be x = 15.
Now that we know what x is, just substitute x for 15 in either equation to solve for y. For this I will be using the second equation.
Since we know that oranges cost $15 and grapefruit cost $20, just add them together to get your answer, which is $35.
Data:
Initial price: $67.000
Price decrease: .30 each year t
The general form of a model of exponential decrease is:
Where P0 is the initial price, r is the rate of decrease and t the number of periods.
Then, for the given situation you get the next equation:
Answer:
Step-by-step explanation:
To solve this problem you must apply the proccedure shown below:
1. You need to apply the Distributive property on the left member of the equation:
2. Now, you must solve for , as following: