Gabrielle's age is three times mikhail's age. the sum of their ages is 56, what is their age?

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.

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16

Which geometric principle is used to justify the construction below?