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icang [17]
3 years ago
12

If x = 4, then 5x = 20

Mathematics
1 answer:
Alexandra [31]3 years ago
3 0

Answer:

Step-by-step explanation:

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Brooklyn has a goal to save $8,000 to buy a new entertainment system. In order to meet that goal, she deposited $4,132.79 into a
densk [106]
To see how much interest she'll get after a quarter:

$4132.79 + ($4132.79 × 0.048) = $4331.16

After two quarters:
$4331.16 + ($4331.16 × 0.048) = $4359.06

You can keep going until eventually reaching $8000 then see how many quarters has passed. That's a lot of calculator work!

There's another way that uses less calculation, but more algebra. I call it the exponential formula method! There's this general formula for stuff that increases exponentially, like virus, population, and MONEY:

m= d {e}^{tc}

M is money, d is deposit, t is time taken, and c is just some unknown constant related to the interest rate. There's also the natural logarithm form of this equation, which will come in handy later:

ln( \frac{m}{d} ) = tc

Alright first we gotta find that constant c for this equation to be useful! Let's plug in stuff we know.

ln( \frac{4331.16}{4132.79} ) = (0.25)c

We know how much she'll have after one quarter (0.25 years), and we know how much she deposited initially.

After pressing some buttons on the calculator we'll find that c = 0.1875.

Great! Now we can use that formula to find how many years (t) it'll take to reach M=$8000. To save time I'm going to use the natural log form:

ln( \frac{8000}{4132.79} ) = t(0.1875)

That will give us t = 3.522 which means it'll take approximately 3.5 years for her deposit to reach $8000!
5 0
3 years ago
Read 2 more answers
The graph of f(x) is shown.
Aleks04 [339]

Answer:

IDK if you still need this but it's A

Step-by-step explanation:

I just took the quiz and got it right :)

3 0
3 years ago
Read 2 more answers
Pls, answer this first CORRECT answer gets the best everything!!
Tomtit [17]

Answer:

9.1 x 10² = 910

9.1 / 10² = 0.091

Step-by-step explanation:

3 0
2 years ago
Read 2 more answers
Which of the following ratlos is not equivalent to 6:10?
Len [333]

Answer:

24/45 or 9/15

Step-by-step explanation:

none of these is equivalent to 6:10

7 0
3 years ago
Which choice shows y=3x+2 and y=3x2 correctly paired with their graphs?
Blababa [14]
Answer:

The second one
7 0
2 years ago
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