When the last 3 digits of a year (such as
1987) are consecutive digits written in
descending order, we'll call the year a
descending year. a descending year will
next occur in the
(a) 23rd century
(b) 24th century
(c) 25th century
(d) 26th century
plz

the aswere is the one with all 8's and the second one is with the 10,8 and 6

step-by-step explanation:

i think it might be a but you might want a second opinion

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)