A lumber company is making boards that are 2777.0 millimeters tall. If the boards are too long they must be trimmed, and if they are too short they cannot be used. A sample of 29 boards is made, and it is found that they have a mean of 2780.9 millimeters with a standard deviation of 12.0. Is there evidence at the 0.1 level that the boards are either too long or too short

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)

he is going to fill two shelves and the third shelf will only have five video games

answer: c

step-by-step explanation