How do you find the missing angles? thank you pls answer will give brainliest

2x + 1 < 5 solve the following inequality. then place the correct number in the box provided.

Collin did the work to see if 10 is a solution to the equation r/4=2.4

The moats separating people from the animals are 5 m wide for lions and 4 m wide for the elephants. if the lion’s moat is 4 m deep, how deep should the elephants’ moat be?