Whats the equation to #4

I'm guessing this is for volume

Step-by-step explanation:

The equation to number 4 is

15 x 10 x 12= 1,800 in³

16 weeks

Step-by-step explanation:

Breanna has a plan to save $25 each week for 5 weeks. This means that the total amount that she would save for 5 weeks would be

5 × 25 = $125

After now, she will increase that amount by $20 for the next 7 weeks during the busy time, then go back to $25 per week. It means that she would earn $(25 + 20) for 7 weeks before going back to the $25 per week plan. Total amount that she would save before going back is

45 × 7 = $315

If Breanna’s plan is to save $540, then the amount of money remaining for him to save would be

545 - (315 + 125) = 540 - 440 = $100

If she earns $25 per week, number of weeks that it will take to earn $105 would be 105/25 = 4

Therefore, total number of weeks would be

5 + 7 + 4 = 16 weeks