Si sumamos el cuadrado de un número más el cuadruple del siguiente resulta 225 ¿De que número se trata?

In the field of thermodynamics, rankine is the unit used to measure temperature. one can convert temperature from celsius into rankine using the formula c= r/1.8 - 273, what is the temperature in celcius corresponding to r degrees rankine.

Samantha swam upstream for some distance in one hour. she then swam downstream the same river for the same distance in only 12 minutes. if the river flows at 4 mph, how fast can samantha swim in still water?

Negative 5 1/12 + negative 4 1/4 + 6 3/4