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olya-2409 [2.1K]
2 years ago
12

Translate the​ phrase; then simplify. Find the sum of −45​, −13​, and 37.

Mathematics
1 answer:
Wewaii [24]2 years ago
8 0

Answer:

-21

Step-by-step explanation:

37 - 45 - 13 is translated

-8 - 13

-21

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1. A drink and a box of popcorn together cost 90p. Two drinks and a box of popcorn together cost £1.45. What does a box of popco
Serga [27]
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.
5 0
3 years ago
A trinomial with a leading coefficient of 3 and a constant term of −5
allsm [11]

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:

6 0
3 years ago
The index of refraction of quartz is anisotropic. Suppose that visible light is passing from one grain to another of different c
Anestetic [448]

Answer:

The reflectivity at the boundary of the two grains is 2.9×{10}^{-3}

Step-by-step explanation:

Given :

Refractive index of one grains (n_{1}) = 1.553

Refractive index of second grains (n_{2}) = 1.544

According to the fresnel equation,

∴ general equation of refraction ( reflectivity ) r = \frac{ n_{1} cos\alpha _{i}  - n_{2}cos_{t} }{ n_{1} cos\alpha _{i}  + n_{2}cos_{t} }

where cos\alpha _{i} = incident angle, cos\alpha _{t} = transmitted angle

but for normal incidence \alpha = 0°

so our equation become,

⇒   r =  \frac{n_{1} - n_{2} }{n_{1} + n_{2}}

     r = \frac{1.553 - 1.544}{1.553 + 1.544}

     r = \frac{0.009}{3.097}

     r = 2.9×10^{-3}

Therefor reflectivity at the boundary is given by r = 2.9×10^{-3}.

3 0
3 years ago
Name the multiplicative inverse of 7i.
Nataly [62]

Answer:

7i

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
Please help due today!!!
sweet-ann [11.9K]
The first answer is B

The second answer is D
4 0
3 years ago
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