27 square yards roughly. 6*4.5=27 feet for one bulletin board. 27*3 is 81 for all three bulletin boards, then you divide by three to convert to square yards and get 27 square yards! Hope this helps!
R<span> = √(2² + 5²) = √29 = 5 and change. Simple Pythagorean calc. Draw a picture and you will see it.</span>
Simply post the picture of the equation with a bit of information you think is needed. or write down the equation and post it !
Answer:
$20
Step-by-step explanation:
We are given the percentages of how much she spent on each purchase but we need the percentage of what is left after each purchase. We calculate this by subtracting each percentage from 100% like so.
100% - 40% = 60%
100% - 20% = 80%
100% - 50% = 50%
Next we need to do is change the percentages into decimal format. We do this by moving the decimal 2 digits to the left. Therefore the percentages wasted are the following
60.0% ⇔ 0.60
80.0% ⇔ 0.80
50.0% ⇔ 0.50
Now that we have the percentages in decimal format we can calculate the total price (t) by retracing the spending process. The spending process was following.
![t_{2} = 0.60t](https://tex.z-dn.net/?f=t_%7B2%7D%20%3D%200.60t)
![t_{3} = 0.80t_{2}](https://tex.z-dn.net/?f=t_%7B3%7D%20%3D%200.80t_%7B2%7D%20)
![4.80 = 0.50t_{3}](https://tex.z-dn.net/?f=4.80%20%3D%200.50t_%7B3%7D%20)
So we have to retrace by solving for
, then
, and finally (t)
... divide both sides by 0.50
![9.60 = t_{3}](https://tex.z-dn.net/?f=9.60%20%3D%20t_%7B3%7D%20)
.... divide both sides by 0.20
![12 = t_{2}](https://tex.z-dn.net/?f=12%20%3D%20t_%7B2%7D%20)
.... divide both sides by 0.60
Finally we can see that the Total amount of money that Alice had before lunch was $20