Answer:
Step-by-step explanation:
Elimination method:
Add these equations to eliminate x:
Then solve for y:
Write down an original equation:
Substitute 4 for y in :
{ and } ⇒ 
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<em>hope this helps...</em>
Step-by-step explanation:
mean when 82 is present
=<u>8</u><u>2</u><u>+</u><u>4</u><u>4</u><u>+</u><u>2</u><u>7</u><u>+</u><u>9</u><u>6</u><u>+</u><u>6</u><u>9</u><u>+</u><u>8</u><u>0</u><u>+</u><u>7</u><u>5</u><u>+</u><u>8</u><u>3</u><u>+</u><u>5</u><u>6</u><u>+</u><u>9</u><u>8</u>=<u>7</u><u>1</u><u>0</u>
10 10
= 71
mean when 42 is present
=<u>4</u><u>2+44+27+96+69+80+75+83+56+98</u>=<u>6</u><u>7</u><u>0</u>
10 10
=67
therefore the mean decreases with
= 71 - 67 = 4
Use the interest formula, fill in the given numbers, and solve for the remaining value.
.. I = Prt
.. 30 = 500*.03*t . . . . . substitute the given values
.. 30/15 = t = 2 . . . . . . . divide by the coefficient of t and evaluate
The time is 2 years.
To make any meaningful calculations here, you'll have to think about how the area of each room is calculated, as well as to invent how much per square yard the various types of carpeting cost.
Note that the cost of carpeting one room would be (room area)(carpet cost per square foot).
