What does this mathematical rebus means ?

The following sentence is false. The preceding sentence is true.
Are these two sentences true or false?

If EELS + MARK + BEST + WARY = EASY

What does HELP + BARK + WARD + LEAD equal?

A rubber ball keeps on bouncing back to 2/3 of the height from which it is dropped. Can you calculate the fraction of its original height that the ball will bounce after it is dropped and it has bounced four times without any hindrance ?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

Which is faster, Heat or Cold ? Explain.

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

Identify The phrase in the picture.

Can you find out which options fits best with the missing column?

Once upon a time, there was a castle on a square island. The entire island was surrounded by a 14m wide trench. The Romans had wanted to invade the castle and had brought a few wooden planks along with them to facilitate themselves in crossing the moat. The planks were however found to be only 13m long.

The Romans still managed to cross the trench. How did they do it?