What is the shortest distance between point M and point D?

Select the missing number from the given responses.

Find the missing letter.

Select the missing number from the given responses. 

Find the missing term:

Choose the correct alternative from the given ones that will complete the series.

3.5 , ?,  8.3, 10.7, 13.1 , 15.5

Find the missing term:

30       22.5          15       9.375        ?

Insert the correct missing number from the choices given below:

Find the missing number.

20, 30, 42, 56, 72, ?

Find the missing number.

In the following expression find the missing term: