El maestro de Química indicó que el examen vale el 40% de la calificación, los ejercicios en clase el 20%, las tareas el 10% y las prácticas de laboratorio el 30%. Uno de los alumnos, Javier, sacó 8.5 en el examen, 9 en los ejercicios en clase, 7.5 en las tareas y 7 en las prácticas de laboratorio. Calcula la media ponderada de las calificaciones de Javier.

the inequality is:

250c+180g≥950

step-by-step explanation:

let c denotes the number of days in a week   miyoko worked as a cryptographer.

and g denotes the number of days in a week she works as a geologist.

now we are given that she earns $250 for every day she works as a cryptographer,and earns $180 for every day she works as a geologist.

now miyoko's goal is to earn more than $950 this week.

hence, the inequality could be represented as:

250c+180g≥950

add -60 to 120 which will result in : 2x+3y=180

then subtract 2x: 3y=-2x+180

lastly, divide by 2: y= -2/3x+60

hope this is the answer you're looking for: )

answer is  

a.

5.56

hope you get this right.

all of them

step-by-step explanation:

zero eats the zero