What is the reason for statement 3, statement 4, and statement 5?

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Solve -3 (r + 5) = -9 enter ur answer in the box x = __

Manuel drives 300 miles to orlando fl. he drives at 50 mile per hour. after driving for two hours he takes 15 minutes break two hours after his first break he takes a 30 minutes break the he drive for two hours more including the two breaks how long does it take manuel to drive to orlando