anonymous
  • anonymous
Kelsey painted one-fourth of her bedroom in three-sevenths of an hour. At this rate, how long would it take her to paint the entire room
Mathematics
schrodinger
  • schrodinger
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jim_thompson5910
  • jim_thompson5910
We have this ratio \[\Large \frac{1}{4} \ \text{bedroom} \ : \ \frac{3}{7} \ \text{hour}\] Multiply both parts by 4 to turn the "1/4" into "4/4" which is just 1 \[\Large {\color{red}{4*}}\frac{1}{4} \ \text{bedroom} \ : \ {\color{red}{4*}}\frac{3}{7} \ \text{hour}\] \[\Large \frac{4}{4} \ \text{bedroom} \ : \ \frac{12}{7} \ \text{hour}\] \[\Large 1 \ \text{bedroom} \ : \ \frac{12}{7} \ \text{hour}\]
jim_thompson5910
  • jim_thompson5910
12/7 = 1.714 approximately it takes roughly 1.714 hours to paint the whole room
anonymous
  • anonymous
thanks

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jim_thompson5910
  • jim_thompson5910
no problem
anonymous
  • anonymous
Margie calculated that she would spend $175 on school supplies this year. She actually spent $97.50 on school supplies. What is Margie’s percent of error
anonymous
  • anonymous
77.3% 79.5% 44.2% 4.4%
jim_thompson5910
  • jim_thompson5910
have a look at this page https://www.mathsisfun.com/numbers/percentage-error.html
anonymous
  • anonymous
i get 72.5
jim_thompson5910
  • jim_thompson5910
Did you use the formula \[\Large \frac{|\text{Approximate Value} - \text{Actual Value}|}{| \text{Actual Value}|}\times 100\%\] they show it on the page
anonymous
  • anonymous
oh no i didnt
jim_thompson5910
  • jim_thompson5910
They also posted this How to Calculate Here is the way to calculate a percentage error: Step 1: Calculate the error (subtract one value form the other) ignore any minus sign. Step 2: Divide the error by the exact value (we get a decimal number) Step 3: Convert that to a percentage (by multiplying by 100 and adding a "%" sign)
anonymous
  • anonymous
whats the approximate value
anonymous
  • anonymous
nvm
jim_thompson5910
  • jim_thompson5910
it's the estimate
anonymous
  • anonymous
i couldnt find the answer can you tell me ill give you a medal
jim_thompson5910
  • jim_thompson5910
approximate = 175 (this is the amount she estimates) actual = 97.50 (actual amount she spends)
jim_thompson5910
  • jim_thompson5910
does that help?

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