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valentina_108 [34]
3 years ago
13

in one day, annie traveled 5 times the sum if the number of hours brian traveled and 2. Together they traveled 20 hours. Find th

e number of hours eacg person traveled.
Mathematics
1 answer:
Alex17521 [72]3 years ago
8 0
\bf \textit{Annie travelled 5 times the hours of Brian}\\
\textit{the hours of both sum up to \underline{20}}
\\\\\\
\begin{cases}
b=\textit{hours Brian travelled}\\
a=\textit{hours Annie travelled}\\
----------\\
\boxed{a}=5b\\
a+b=\underline{20}
\end{cases}
\\\\\\
\boxed{5b}+b=20\implies 6b=20\implies b=\cfrac{20}{5}\implies b=4

how many hours Annie travelled?  Well, a = 5b.
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Yvonne bought a car for $10,300. After 3 years, the value of the car was $6,250. The value of this car decreases exponentially o
Likurg_2 [28]

Answer:

A = $44,778.84

A = P + I where

P (principal) = $10,300.00

I (interest) = $34,478.84 or 12 months

Step-by-step explanation:

Given: Yvonne bought a car for $10,300. After 3 years, the value of the car was $6,250. 50%

To find: In approximately what number of additional months will the value of Yvonne’s car be 50% of the price she originally paid?

Formula: (\frac{interest rate}{number of payments}) × loan principal = interest

Solution:  Divide your interest rate by the number of payments you’ll make in the year (interest rates are expressed annually). So, for example, if you’re making monthly payments, divide by 12. Multiply it by the balance of your loan, which for the first payment, will be your whole principal amount.

(This gives you the amount of interest you pay the first month.)

First, convert R as a percent to r as a decimal

r = R/100

r = 50/100

r = 0.5 rate per year,

Then solve the equation for A

A = P(1 + r/n)nt

A = 10,300.00(1 + 0.5/12)(12)(3)

A = 10,300.00(1 + 0.041666667)(36)

A = $44,778.84

Henceforth:

The total amount accrued, principal plus interest, with compound interest on a principal of $10,300.00 at a rate of 50% per year compounded 12 times per year over 3 years is $44,778.84.

6 0
3 years ago
10x + 10y = −10<br> 9x + 10y = −18
andreev551 [17]

Answer:

Step-by-step explanation:

10x+10y=-10

9x+10y=18

= 10x+10y=-10

-9x-10y=18

= x=8

step two is to find y:

10x+10y=-10

10(8)+10y=-10

80+10y=-10

10y=-90

y=-9

your answer:

(x,y)= (8,-9)

5 0
3 years ago
Read 2 more answers
Write an equation of a circle with a center at (2, - 4) and a radius of 4.
fgiga [73]

9514 1404 393

Answer:

  (x -2)^2 +(y +4)^2 = 16

Step-by-step explanation:

The equation of a circle with center (h, k) and radius r is ...

  (x -h)^2 +(y -k)^2 = r^2

You have (h, k) = (2, -4) and r = 4, so your equation is ...

  (x -2)^2 +(y -(-4))^2 = 4^2

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6 0
3 years ago
PLS HELP IM BEING TIMED 2 FOR BRAINLIEST
taurus [48]

Answer:

figure skates will be $1 cheaper.

Explanation:

<u>given equation</u>:

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<u>solve for rent of figure skates</u>:

f(x) = 1.50x + 2.00

f(3) = 1.50(3) + 2.00

f(3) = 6.5

<u>solve for rent of hockey skates</u>:

h(x) = 2x + 1.5

h(3) = 2(3) +1.5

h(3) = 7.5

<u>cheaper - figure skates than hockey skates</u>:

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$1

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2 years ago
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Dominik [7]

Answer:

x= 4, -1

Step-by-step explanation:

-2x - 2 + x^2 + x + 180 - 2x - 2 = 180

add like terms and put in descending order

x^2 - 3x + 176 = 180

subtract 180 from both sides

x^2 - 3x - 4 = 0

factor out the equation

(x-4)(x+1)=0

solve for x

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x=4            x=-1

5 0
3 years ago
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