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4 years ago

Help me please please

Mathematics

1 answer:

Xelga [282]4 years ago

5 0

You know that 1/4, or 25% of the balloons are disney balloons. There are five disney balloons. That means for every 1/4 balloons, there are five balloons. You are missing 3/4 of this, just multiply 3 by 5. That is fifteen balloons. Add the five disney character balloons.

20 balloons total.

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A farmer has a total of 21 cows and chickens altogether The animals have 54 legs how many cows and how many chickens does the fa

Sedbober [7]

Answer:

The farmer has 4 cows and 15 chickens.

Step-by-step explanation:

This question can be solved using a system of equations.

I am going to say that:

x is the number of cows

y is the number of chickens.

A farmer has a total of 21 cows and chickens altogether

This means that x + y = 21.

The animals have 54 legs

A cow has four legs, while a chicken has 2 legs. So

4x + 2y = 54.

From the first equation:

y = 21 - x

Replacing

4x + 2(21 - x) = 54

4x + 42 - 2x = 54

2x = 12

x = 6

y = 21 - x = 21 - 6 = 15

The farmer has 4 cows and 15 chickens.

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3 years ago

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Arlecino [84]

14 or -4.

If the difference of A and B is 9 and B = 5, then A is either 9 higher which is 14, of 9 lower which is -4.

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You read 50 pages in an hour. Your sister reads 40 pages in an hour. Explain how to find out how many more pages you read than y

fredd [130]

C because you have to do 50÷2=25 and 40÷2=20 and 20-25=5

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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.

$A = 2P$