Mr. DeVizia is trying to determine how long packages of cookies stay fresh on store shelves, and the extent to which the type of packaging and the store’s temperature influence how long the packages of cookies stay fresh. He designs a completely randomized experiment involving low (64 ºF) and high (75 ºF) temperatures and two types of packaging—plastic and waxed cardboard. What are the experimental units in this experiment.

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.

the photograph is photographer and- in the process- ourselves.

step-by-step explanation:

the answer would be c