The formula for the cost of the total sales is: 8a+5c where a is the number of adult tickets and c is the number of child tickers.

If he keeps 15% the formula is: 0.15(<span>8a+5c) </span>

6 0

3 years ago

Element X is a radioactive isotope such that every 25 years, its mass decreases by half. Given that the initial mass of a sample

Julli [10]

50*(.5)^(23/25)=26.43

7 0

2 years ago

Christopher estimates it will take him half an hour to complete his math homework. He is able to complete it in 25 minutes. What

marin [14]

Answer:

The percent error in his estimate is<u> 16.67%</u>.

Step-by-step explanation:

Given:

Christopher estimates it will take him half an hour to complete his math homework.

He is able to complete it in 25 minutes.

Now, to find the percent error in his estimate.

Time estimates of completing homework = 30 minutes.

Time actual taken to complete homework = 25 minutes.

Error in estimate = Time estimates of completing homework - Time actual taken to complete homework.

Error in estimate = 30 minutes - 25 minutes.

Error in estimate = 5 minutes.

Now, to get the percent error:

$Percent\ error =\frac{Error\ in\ estimate}{Time\ estimates\ of\ completing\ homework} \times 100.$

$Percent\ error=\frac{5}{30} \times 100$

$Percent\ error=\frac{500}{30}$

$Percent\ error=16.67\%.$

Therefore, the percent error in his estimate is 16.67%.

6 0

3 years ago