Your formal singular in Spanish is -tu singular formal-
Cocinar- To cook
cocino
cocinas
cocina
cocinamos
cocinan
amasar- To knead
amaso
amasas
amasa
amasamos
amasan
machacar- To crush
machaco
machacas
machaca
machacamos
machacan
asar- To roast/grill
aso
asas
asa
asamos
asan
hervir- To boil
hiervo
hierves
hierve
hervimos
hierven
freír- To fry
frío
fríes
fríe
freímos
fríen
añadir- To add
añado
añades
añade
añadimos
añaden
Comer- To eat
como
comes
come
comemos
comen
beber- to drink
bebo
bebes
bebe
bebemos
beben
Nosotros somos de Guatemala.
Because ser is for more permanent things, like character traits or nationalities, while estar is more for temporary things like feelings or current location
How to remeber ser and estar easy
for how you feel or where you are, always use the verb estar
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Cincuenta is 50..and veinte is 20. When you add them together, they add up to 70. So, the answer is setenta.