Tengo una factura mensual de 100 minutos en llamadas de teléfono.
La compañía A me ofrece una cuota mensual de 10 euros y un precio de 5
céntimos el minuto. La compañía B no me cobra cuota mensual y me factura el
minuto a 10 céntimos. Da la expresión analítica del coste mensual en cada
compañía y decide cuál es la que más se ajusta a mis necesidades.

answer:   c ?

step-by-step explanation:

image for option 4

step-by-step explanation:

i just know the internet

delaney would like to make a 5lb nut mixture that is 60% peanuts and 40% almonds.

she has several pounds of peanuts and several pounds of a mixture that is 20% peanuts and 80% almonds.

let 'p' represent the number of pounds of peanuts needed to make the new mixture, and  

let 'm' represent the number of pounds of the 80% almond-20% peanut mixture.

:

p + m = 5

therefore

m = (5-p)

write an equation based on the percent of peanuts

1p + .2m = .6(5)

replace m with (5-p)

p + .2(5-p) = .6(5)

p + 1 - .2p = 3

p - .2p = 3 - 1

.8p = 2

p = 2/.8

p = 2.5 lbs of peanuts required

then

5 - 2.5 = 2.5 lbs of the peanut/almond mixture required

:

a) what is the system that models this situation?

p + m = 5

1p + .2m = .6(5)

the area of ​​the surface of the rectangular prism here is 250 cm2, which is the surface of the shading

step-by-step explanation: