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Aleonysh [2.5K]
3 years ago
8

Sally’s parents deposited $15,000 into a college savings account on her third birthday. The account had an interest rate of 9.6%

compounded annually. They were hoping that the money would double twice by the time she was 18 years old. Using the rule of 72, mc009-1.jpg will their hopes come true? Yes, the $15,000 will double each 7.5 years. In 15 years, it will double twice. Yes, the $15,000 will double in 7.5 years and be four times as much in 15 years. No, the $15,000 will only double once in 15 years, not double twice. No, it will take 30 years for the $15,000 to double twice.
Mathematics
2 answers:
oee [108]3 years ago
5 0
Rule of 72 says to divide 72 by the rate of return and that will be the number of years an investment will double
 so 72 / 9.6 = 7.5 years to double

7.5 * 2 = 15 years

18-3 = 15

 the answer is: <span>Yes, the $15,000 will double each 7.5 years. In 15 years, it will double twice.</span>

Rzqust [24]3 years ago
5 0
The correct answer is Yes! The 15,000 dollars will double.
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a rectangle is made by joining two squares adjacent to each other as shown below. if one squared has an area of 144 squared cent
liberstina [14]

Answer:

Hello! After reading your question I have deduced that the correct answer is 288² cm.

Step-by-step explanation:

The way I came to this conclusion was as follows:

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If said rectangle is two squares put side by side (adjacent), then a valid assumption is that both squares are the same size.

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Thus both of the squares are going to be the same size, so they will have the same area.

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3 0
2 years ago
Two trains start from Fort Worth traveling at the same speed. The trip for Train W takes 20 hours, while the trip for Train Z ta
MrMuchimi

Answer:

The equation that best models this situation is :

b. \frac{x}{20}=\frac{x+400}{25}

Distance traveled by Train W = 1600 miles

Distance traveled by Train Z = 2,000 miles

Step-by-step explanation:

Given:

Time taken for Train W to complete a trip = 20 hours

Time taken for Train Z to complete a trip = 25 hours

The city Train Z is traveling to is 400 miles farther away than the city Train W is traveling to.

both trains have same speeds and start from same location.

To find the distance in total each train travels.

Solution:

<em>Let length of the trip of Train W be </em>= x miles

Speed of Train W can be given as :

⇒ \frac{Distance}{Time}

⇒ \frac{x}{20}\ miles/h

<em>So, the length of the trip of Train Z will be</em> = (x+400) miles

Speed of Train Z can be given as :

⇒ \frac{Distance}{Time}

⇒ \frac{x+400}{25}\ miles/h

Since the speeds are same, so the equation to find x can be given as:

⇒ \frac{x}{20}=\frac{x+400}{25}

Solving for x

Multiplying both sides by 100 to remove fractions.

⇒ 100\times \frac{x}{20}=100\times \frac{x+400}{25}

⇒ 5x=4(x+400)

Using distribution.

⇒ 5x=4x+1600

Subtracting both sides by 4x

⇒ 5x-4x=4x-4x+1600

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