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Vlad1618 [11]
3 years ago
11

A sum of money is invested at 21% compounded quarterly. About how long will it take for the amount to double

Mathematics
1 answer:
melamori03 [73]3 years ago
8 0
Use 72 rule
72/rate=Time
72÷21=3.4 years
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Find the roots. 2x 2 + 7x - 15 =0
Reika [66]
So you always want to pull out the gcf first but since there isn't one, we can move on.
so we can make an acb chart which is multiplying the a value and the c value and find factors that of that product that will equal the b value.
a value is 2
c value is -15
b value is 7
-30 factors to equal 7 = 10, -3
10 - 3 = 7
so the factors 10 and -3 work. 
so now you make 2 separate parenthesis with one of the factors and one x. and it should be set equal to 0.
(x+10)(x-3) = 0
now solve for x in each separate parenthesis. 
x = -10 
x = 3
those r the roots
hope this helps
4 0
3 years ago
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Use a calculator to find the square for 7.6​
natita [175]

Answer:

Using a calcuator, 7.6^{2} =57.76

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2 years ago
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Remainder of 42325/47=
m_a_m_a [10]
The answer is 900 r25
7 0
3 years ago
Each day, a young person should sleep 9 hours plus 1 4 hour for each year that the person is under 18 years of age. Assuming the
Andre45 [30]

Answer:

y(x) = 9 + 0.25*(18 - x)

Step-by-step explanation:

We have the following variables:

y: hours of sleep

x: age

Each day, a young person should sleep 9 hours

This means that y is 9 added to something

plus 1 4 hour for each year that the person is under 18 years of age.

For each year the person is under 18 years of age, she should sleep 1/4 = 0.25h on top of the 9 hours.

So the equation relating hours of sleep y and age x is:

y(x) = 9 + 0.25*(18 - x)

7 0
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A spinner with 8 equal parts, labeled 1 to 8, is used in a board game. you spin the spinner one time. what is the theoretical pr
stiks02 [169]

Answer:

1 in 8; or 12.5% of the time

Step-by-step explanation:

There are eight outcomes. One of eight of those outcomes is a 2.

1/8 = 0.125

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3 years ago
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