Solve

Next to each arrow, describe what is done in each step.

Match each expression in the first list with an equivalent expression from the second list.

The height of the water in a tank decreases by 3.5 cm each day. When the tank is full, the water is 10 m deep. The water tank needs to be refilled when the water height drops below 4 m.

1. Write a question that could be answered by solving the equation .
2. Is 100 a solution of ? Write a question that solving this problem could answer.