Spanish language Q&A Forum

In the Superbike translation exercise, you translated "We'll always remember this day" as "Vamos a acordarnos siempre de este día".  Why is "Vamos a recordar siempre de este dia" not also correct ?

For the quiz question ¿ _____ venir a la alberca? (Do you want to come to the pool?) there are 40+ possible answers in the dropdown, including some which look like nonsense. Is this an error in the system?

This should be "describe a scene" I think...

¿Cuántos euros te quedan en la cartera? -Me quedan ochenta.
How many euros do you have left in your purse? -I have eighty left. 

The above is using preterite translated to present perfect. This is a subject I have some trouble understanding. Wondering if quedar is one of those examples of language that doesn't translate exactly and have to accept it as an expression used and not over think it?

It sounds to me as if the the letter "c" is variously pronounced "th" or "s" or "k".  What are the rules for pronunciation of the letter "c".

How do I know when a noun is masculine or feminine?

Do I go off the last letter of the noun? Like planta and idea end in 'a' so I use una, but if it ends in an 'o' or any other letter besides 'a' then I say un.