3x + 15 = 34
3x = 19
x = 6 1/3 is the answer to the question
Answer:
Volume = 1114.1 
Step-by-step explanation:
Recall that the formula for the volume of a pyramid is given by:

where B is the area of the pyramid's base (in our case a square of side 12,8 in), and H the pyramid's height (in our case 20.4 in).
Then the square base of the pyramid has an area given by: 
Finally,we can now write the volume of the pyramid as:

Rounding the answer to a tenth of a cubic inch, we get:
Volume = 1114.1 
540 is the answer because the doubled the first number to get the second number and multiplyed that by 3 to get the third number
Answer: it would take her 25 minutes I believe
Step-by-step explanation: