How many ordered quadruples (a, b,c, d) satisfy "a+b+c+d=18", where "a, b,c, d" are positive integers?

hi! i think the answer is 1/2 : )

the correct answers i think are b. and d.

give me brainliest if it is correct!

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)

this is ms. king.

just remember - if you can look it up, so can i.   i really hope that your submitted assignment doesn't look like any i find here, or like any other student's.

or, you can ask me for

step-by-step explanation: