Can you solve the photo plexer logic ?

There is a place where if I stand up straight, I will still be considered sideways.

You have to put a letter on the following to make it a meaningful word. The only challenge is that you can't use 'E'.

S E Q U E N C _

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

A few friends are enjoying their sea voyage in a boat full of apples. On the way, they felt hungry and thus decided to eat the apples. Together, they ate two dozen of apples. When they have eaten the apples, will there be any change in the water level?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

Can you make the number 24 by utilizing the numbers 1, 3, 4 and 6? You must use one number only one time and you can use mathematical operation symbols anytime anywhere.

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

Find the mistake in the below maths equations

A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1

Which word does the below Plexor means ?