I need help asap :):):)

Mathematics

2 answers:

Diano4ka-milaya [45]3 years ago

8 0

Answer: I think the last option is the correct answer.

Step-by-step explanation:

Rom4ik [11]3 years ago

4 0

The last one is the correct option!
It’s correct because, he needs to spend either equal to or less than $100 because that’s all he has so that is where the less than it equal to sign comes in. Next the boat is $12.50 per hour but to set aside food he needs to leave out $25. So your equation would be $12.50h-$25 less than or equal to $100!!

- hope this helped!!

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Use the "rule of 72" to estimate the doubling time (in years) for the interest rate, and then calculate it exactly. (Round your

Law Incorporation [45]

Answer:

According to the rule of 72, the doubling time for this interest rate is 8 years.

The exact doubling time of this amount is 8.04 years.

Step-by-step explanation:

Sometimes, the compound interest formula is quite complex to be solved, so the result can be estimated by the rule of 72.

By the rule of 72, we have that the doubling time D is given by:

$D = \frac{72}{Interest Rate}$

The interest rate is in %.

In our exercise, the interest rate is 9%. So, by the rule of 72:

$D = \frac{72}{9} = 8$ .

According to the rule of 72, the doubling time for this interest rate is 8 years.

Exact answer:

The exact answer is going to be found using the compound interest formula.

$A = P(1 + \frac{r}{n})^{nt}$

In which A is the amount of money, P is the principal(the initial sum of money), r is the interest rate(as a decimal value), n is the number of times that interest is compounded per unit t and t is the time the money is invested or borrowed for.

So, for this exercise, we have:

We want to find the doubling time, that is, the time in which the amount is double the initial amount, double the principal.

is double the initial amount, double the principal.

$A = 2P$