Ask question

Ask question

All categories

3 years ago

13

At the beginning of every year molly deposits 200 in a savings account thst offers 20% interest annually. The total amount molly

woukd have in her account after 3 years is? I got 345.60 but wrong?

1 answer:

Alexeev081 [22]3 years ago

5 0

3 years
200 * (1.2)^3 = <span> <span> <span> 345.6</span></span></span>0

2 years
200 * (1.2)^2 = 288.00

1 years
200 * 1.2^1 = 240.00

It seems you calculated 200.00 for 3 years.
You need the total which equals:
<span> <span> 345.6</span></span>0 + 288.00 + 240.00
= 873.60

There is a formula for this:
Total = Amount * ([(1+rate)^(years+1) -1] / rate) - amount
Total = 200 * ([(1.20^4) -1] / .20) - 200
Total = 200 * [( <span> <span> <span> 2.0736 </span> </span> </span> -1) / .20] -200
Total = 200 * ( <span><span><span>1.0736 </span> </span> </span> / .20) - 200
Total = 200 * <span> <span> <span> 5.368 </span> </span> </span> -200
Total = <span> <span> <span> 1073.6 </span> </span> </span> -200
Total = 873.60

You might be interested in

You have one cubic mile of water. you release it at 1000 gallons per

Tatiana [17]

It will take 764664.6875 days to empty the water

<h3>How to determine the time to empty?</h3>

The given parameters are:

Volume = 1 cubic mile
Rate = 1000 gallons per minutes

The time is calculated as:

Time = Volume/Rate

So, we have:

Time = 1 cubic mile ÷ 1000 gallons per minute

Convert gallons to cubic mile

Time = 1 cubic mile ÷ (9.0817e-13 * 1000) cubic mile per minute

Divide

Time = 1.10111715 × 10^9 minute

Convert to days

Time = 764664.6875 days

Hence, it will take 764664.6875 days to empty the water

Read more about volumes at:

brainly.com/question/1972490

#SPJ1

7 0

1 year ago

Carpenters use a tool called a speed square to help them mark right angles . A speed square is a right triangle

Ronch [10]

Answer:

A. $Area = \frac{1}{2}(2x^2 - 2x - 24)$

B. $Area = 3.75 in^2$

Step-by-step explanation:

A. $Area = \frac{1}{2}bh$

Where,

$b = 2x + 6$

$h = x - 4$

Plug in the values to get a polynomial that represents the area of the tool

$Area = \frac{1}{2}(2x + 6)(x - 4)$

$Area = \frac{1}{2}(2x(x - 4) + 6(x - 4)$

$Area = \frac{1}{2}(2x^2 - 8x + 6x - 24)$

$Area = \frac{1}{2}(2x^2 - 2x - 24)$

B. To find area, when x = 4.5 in, plug in the value of x into the equation for the area of the tool.

$Area = \frac{1}{2}(2(4.5)2 - 2(4.5) - 24)$

$Area = \frac{1}{2}(2(20.25) - 9 - 24)$

$Area = \frac{1}{2}(40.5 - 9 - 24)$

$Area = \frac{1}{2}(7.5)$

$Area = 3.75 in^2$

8 0

3 years ago

What is the common ratio of the sequence?<br> -2, 6, -18, 54,...

marta [7]

Answer:1:3

Step-by-step explanation:

4 0

3 years ago

.hoi I need a lil help

mihalych1998 [28]

Answer:

10

Step-by-step explanation:

4+5=9 and 1/2+1/2 =1 so 9+1=10

6 0

2 years ago

Read 2 more answers

Solve with solution...no spam answers pls

Agata [3.3K]

<span>Let's analyze Hannah's work, step-by-step, to see if she made any mistakes.

</span>In Step 1, Hannah wrote $\dfrac{d}{dx} (-3+8x)$ <span> as the sum of two separate derivatives </span> $\dfrac{d}{dx}(-3)+ \dfrac{d}{dx} (8x)$ <span>using the </span><span>sum rule.
</span>
This step is perfectly fine.

In Step 2, $\dfrac{d}{dx}(8x)$ was kept as it is, and $\dfrac{d}{dx}(-3)$ was rewritten as $0$ using the constant rule.Indeed, according to the constant rule, the derivative of a constant number is equal to zero.

This step is perfectly fine.

In Step 3, $\dfrac{d}{dx} (8x)$ was rewritten as $\dfrac{d}{dx}(8) \dfrac{d}{dx}(x)$ supposedly using the constant multiple rule.

The problem is that according to the constant multiple rule, $\dfrac{d}{dx}(8x)
$ should be rewritten as $8 \dfrac{d}{dx}(x)$ and not as $\dfrac{d}{dx}(8)\dfrac{d}{dx}(x)$ .

<span>Therefore, Hannah made a mistake in this step.</span>

6 0

3 years ago

Read 2 more answers