Unless they are monsters that are special summon only, level 7+ monsters require 2 tributes.
You need one tribute for a Lv5 or 6 monster, and two tributes for Lv7+, though many higher level monsters have additional or different requirements.
You need to tribute 2 monsters to summon a Lv7 or more monster, so you need 2 for a 'Blue-Eyes White Dragon'.
Not quite. A Synchro Summon is a Special Summon. A Tribute Summon is the same as a Normal Summon, except that when you Tribute Summon you need to tribute monsters. Also you can Special Summon as many times as you want to in a turn, whereas you can only Normal Summon OR Tribute Summon once per turn, except with a card effect.
You need to tribute one monster for the tribute summon of a Lv5 or 6 monster, and two tributes for any that are Lv7 or higher, even Lv10 ones like Yubel. Additionally, some monsters require three tributes (Obelisk the Tormentor, for example), but that is stated on the card, and it not related to the level.
Unless they are monsters that are special summon only, level 7+ monsters require 2 tributes.
You only need 2, like any other tribute monster that's level is 7+
You don't need to sacrifice (tribute) any monsters to summon a level 4 monster. Level five monsters require one sacrifice.
You need one tribute for a Lv5 or 6 monster, and two tributes for Lv7+, though many higher level monsters have additional or different requirements.
You are allowed as many Flip Summons and Special Summons you want as long as there are monster zones available. A tribute summon is counted as a normal summon, and you are only allowed one normal summon per turn.
It depends on the level. If it is 4 stars or under, then no. If it is 5-6 stars, then you need to tribute 1 monster. If it is 7-12 stars, you need to tribute 2 monsters. Many high level monsters cannot be tribute summoned though and will have their own summoning text.
In the Yu-Gi-Oh rule book it states that an 8 star monster only needs 2 tributes.
You can perform as many special summons in a turn as you have available resources to do so, there is no hard limit. Yes, you can use Rescue Cat to summon a Tuner and another monster, and then use them in a Synchro Summon - the turn has a restriction on normal summons, but not Special Summons. (Also note, you do not 'tribute' the components for a Synchro Summon, you just send them to the graveyard.)
You need to tribute 2 monsters to summon a Lv7 or more monster, so you need 2 for a 'Blue-Eyes White Dragon'.
You need to tribute 2 monsters to summon a Lv7 or more monster, so you need 2 for a 'Blue-Eyes White Dragon'.
Not quite. A Synchro Summon is a Special Summon. A Tribute Summon is the same as a Normal Summon, except that when you Tribute Summon you need to tribute monsters. Also you can Special Summon as many times as you want to in a turn, whereas you can only Normal Summon OR Tribute Summon once per turn, except with a card effect.
You need to tribute one monster for the tribute summon of a Lv5 or 6 monster, and two tributes for any that are Lv7 or higher, even Lv10 ones like Yubel. Additionally, some monsters require three tributes (Obelisk the Tormentor, for example), but that is stated on the card, and it not related to the level.