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3 years ago

Solve: 8x2 + 64x = 0

1 answer:

8 0

Solutions

Factor out the common term 8x

8x(x+8)=0

Solve for x

1. Ask: When will x(x+8) equal zero?

2. Answer: When x=0 or x+8=0.

3. Solve each of the 2 equations above:

x=0,−8

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Alma invests $300 in an account that compounds interest annually. After 2 years, the balance of the account is $329.49. To the n

-Dominant- [34]

Invested amount (P) = $300.

Time in years (t) = 2 years.

Balance after 2 years (A) = $329.49.

Let us assume rate of interest = r % compounds annually.

We know, formula for compound interest

$A=P(1+r)^t$

Plugging values in formula, we get

$329.49=300(1+r)^2$

$\mathrm{Divide\:both\:sides\:by\:}300$

$\frac{300\left(1+r\right)^2}{300}=\frac{329.49}{300}$

$\left(1+r\right)^2=1.0983$

Taking square root on both sides, we get

$1+r=\sqrt{1.0983}$

$\mathrm{Subtract\:}1\mathrm{\:from\:both\:sides}$

$1+r-1=\sqrt{1.0983}-1$

$r=\sqrt{1.0983}-1$

$r=1.048-1$

r=0.048.

Converting it into percentage by multiplying by 100.

r=0.048 × 100

r = 4.8 %

Therefore, the rate of interest on the account is 4.8% compounds annually.

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3 years ago

How do u graph x+y=-2

sdas [7]

Answer:

The answer is

$y = - x - 2$

Step-by-step explanation:

The problem is

$x + y = - 2$

First we have to bring x to the other side se we subtract x from both sides

$x + y = - 2 \\ - x \: \: \: = - 2 - x$

Then we have to put it in order so the answer is

$y = - x - 2$

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kumpel [21]

4% of 73 will be 2.92.
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