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andrew-mc [135]
2 years ago
13

In Miami, the number of highway accidents increased by 20% over a four year period. How many accidents were there in 2013 if the

re were 5,120 in 2009?
Mathematics
1 answer:
Masja [62]2 years ago
8 0
.20 x 5,120 = 1024        1024 + 5120 = 6144 
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How do you factor 2x^2+x-3
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Find the factors of -3:
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hope this helps
7 0
2 years ago
Solve c = ab? for b.
jek_recluse [69]

Answer:

b = c/a

Step-by-step explanation:

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3 years ago
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Likurg_2 [28]

Answer:

\frac{-11}{25}+\frac{-27}{25}i given you are asked to simplify

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Step-by-step explanation:

You have to multiply the numerator and denominator by the denominator's conjugate.

The conjugate of a+bi is a-bi.

When you multiply conjugates, you just have to multiply first and last.

(a+bi)(a-bi)

a^2-abi+abi-b^2i^2

a^2+0         -b^2(-1)

a^2+-b^2(-1)

a^2+b^2

See no need to use the whole foil method; the middle terms cancel.

So we are multiplying top and bottom of your fraction by (-3+4i):

\frac{-3+5i}{-3-4i} \cdot \frac{-3+4i}{-3+4i}=\frac{(-3+5i)(-3-4i)}{(-3-4i)(-3+4i)}

So you will have to use the complete foil method for the numerator. Let's do that:

(-3+5i)(-3+4i)

First: (-3)(-3)=9

Outer::  (-3)(4i)=-12i

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Last: (5i)(4i)=20i^2=20(-1)=-20

--------------------------------------------Combine like terms:

9-20-12i-15i

Simplify:

-11-27i

Now the bottom (-3-4i)(-3+4i):

F(OI)L (we are skipping OI)

First:-3(-3)=9

Last: -4i(4i)=-16i^2=-16(-1)=16

---------------------------------------------Combine like terms:

9+16=25

So our answer is \frac{-11-27i}{25}{/tex] unless you want to seprate the fraction too:[tex]\frac{-11}{25}+\frac{-27}{25}i

6 0
3 years ago
The population of a town increased by 10% per year in 2009, 2010, and 2011. If the population of the town at the beginning of 20
Bogdan [553]
If the population was 40,000 at the beginning of 2009, at the end of 2009 it has increased by 10% and became 44,000.

By the same way, at the end of 2010, it became 44000 + \frac{44000*10}{100} = 48400

At the end of 2011, the population was 48400 +  \frac{48400 * 10}{100} = 53240 
4 0
3 years ago
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