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zzz [600]
2 years ago
9

A cell phone plan costs `\$200` to start. Then there is a `\$50` charge each month.

Mathematics
1 answer:
rusak2 [61]2 years ago
5 0

Answer:

200+50x

i think

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HURRY!!!:) Find the sum of (7x+4) and the opposite of 7x.
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Step-by-step explanation:

<u>Sum of (7x+4) and the opposite of 7x:</u>

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X/3 +2y/3= -1 and x-y/3=9 solve. by elimination method​
Galina-37 [17]

Answer:

X=51/7, Y= -36/7

Step-by-step explanation:

X/3 + 2y/3 = -1 equ 1

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X/3 + 2y/3 = -1..... x 1 ( co-efficient of X in equ2 )

X - y/3 = 9 ...... x 1/3 ( co-efficient of X in equ1 )

X/3 + 2y/3 = - 1 equ 3

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( input the value of y into equ 4 )

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3 years ago
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svp [43]

Answer:

Required equation : \frac{1}{t}=\frac{1}{3}+\frac{1}{9}

Together they can paint the same room in 2.25 hours or 2 hours 15 minutes.

Step-by-step explanation:

It is given that Dale Horton can paint a certain room in 3 hours.

One hour woks of Dale Horton = 1/3

Kathy Garcia can paint the same room in 9 hours.

One hour woks of Kathy Garcia = 1/9

Let together they can paint the same room in t hours.

One hour woks of both = 1/t

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\frac{1}{t}=\frac{3+1}{9}

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After reciprocal we get

\frac{t}{1}=\frac{9}{4}

t=2.25

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Therefore, together they can paint the same room in 2.25 hours or 2 hours 15 minutes.

4 0
3 years ago
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