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3 years ago

15

Mira has $760 in her bank account and withdraws $40 each month. Paulina has $210 in her bank account and deposits $70 each month

.In how many months will Mira and Paulina have equal amounts of money in their accounts?
A.

5

B.

7

C.

8

D.

10

1 answer:

Taya2010 [7]3 years ago

3 0

A. 5

1st 2nd 3rd 4th 5th Month
_________________________________

Mira:760 720-680-640-600-560

Paul
ina :210 270-340-410-480-560

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adell [148]

Answer:

$4\dfrac{2}{7}$

Step-by-step explanation:

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<u>Step 1:</u> Calculate the mean.

$\text{Mean}=\dfrac{49+55+52+46+47+42+38}{7}=47$

<u>Step 2:</u> Calculate how far away each data point is from the mean using positive distances. These are called absolute deviations.

$\begin{array}{ccccccc}\text{Sun}&\text{Mon}&\text{Tue}&\text{Wed}&\text{Thu}&\text{Fri}&\text{Sat}\\49&55&52&46&47&42&38\\2&8&5&1&0&5&9\end{array}$

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Answer:

D. y=162.5

Step-by-step explanation:

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so, hmm which are those? let's check, let's set the denominator to 0, and solve for "x".

$\bf x^2+6x-7=0\implies (x+7)(x-1)=0\implies x=
\begin{cases}
-7\\
1
\end{cases}
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