Write an equation to solve each part of the two-step problem ken has 45 stamps. he uses 20 stamps. then he buys 7 more stamps. how many stamps does he have now?

Use this data in the problem below. follow the steps carefully. round to the nearest tenth. lot 3: week 1: 345 week 2: 340 week 3: 400 week 4: 325 step 1. jim enters the data and calculates the average or mean. step 2. jim calculates the deviation from the mean by subtracting the mean from each value. step 3. jim squares each deviation to remove negative signs. step 4. jim sums the squares of each deviation and divides by the count for the variance. step 5. jim takes the square root of the variance to find the standard deviation.

Write the sentence as an equation. z plus 372 is equal to 160

What is always true about a positive integer raised to a negative odd power?