Propellants are chemicals used to power rockets, much like gas is used to power cars. A rocket scientist has been using Propellant X in her rockets for many years, but is interested to see if Propellant Z will cause her rockets to rise higher into the air. The scientist builds a rocket that uses Propellant Z. A proper control for the experiment would be an identical rocket that uses which of the following? (SC.7.N.1.1) A. Propellant X B. Propellant Z C. No propellant D. A mixture of both Propellant X and Propellant Z

you would have to sell 24 bracelets.

step-by-step explanation:

84/3.5 = 24

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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)