Which of the following values of r will result in a true statement when substituted into the given equation? -r + 5(r + 2) = -10
2 answers:
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Answer:
The store should use 112.5 pounds of Brazilian coffee and 37.5 pounds of Colombian cofee.
Step-by-step explanation:
Let "b" be the amount of Brazilian coffee, in pounds, required for the blend and "c" the amount of Colombian coffee required, in pounds.
Since there are two unknown variables a two-equation system is needed to solve the problem, we can set up one equation for weight and another for price as follows:
Solve for "c" by multiplying the first equation by -10 and adding it to the second one:
Now, solve for b by replacing the value obtained into the first equation
The store should use 112.5 pounds of Brazilian coffee and 37.5 pounds of Colombian cofee.
Answer:
Step-by-step explanation:
Exponential growth function:
The exponential growth function for a population, after t years, is given by:
In which P(0) is the initial population and r is the growth rate.
A warren of rabbits has a population of 350. The population is increasing at a rate of 3% per year.
This means that
So
How can you write an exponential growth function to find the monthly growth rate?
Monthly growth rate means that the time is divided by 12(as one year has 12 months), so the equation will be: