Let d stand for the cost of a drink and p stand for the cost of a box of popcorn.
d + p = 0.9
2d + p = 1.45
d + p = 0.9
d = 0.9 - p
2(0.9 - p) + p = 1.45
1.8 - 2p + p = 1.45
1.8 - p = 1.45
-p = -0.35
p = 0.35
A box of popcorn costs 35p.
Answer:
Option C is correct because it is a trinomial with a leading coefficient of 3 and a constant term of -5
Hope this helepd you!
Step-by-step explanation:
Answer:
The reflectivity at the boundary of the two grains is
×
Step-by-step explanation:
Given :
Refractive index of one grains (
) = 1.553
Refractive index of second grains (
) = 1.544
According to the fresnel equation,
∴ general equation of refraction ( reflectivity ) 
where
= incident angle,
= transmitted angle
but for normal incidence
°
so our equation become,
⇒ 


×
Therefor reflectivity at the boundary is given by
×
.
Answer:
7i
Step-by-step explanation:
The first answer is B
The second answer is D