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Effectus [21]
3 years ago
7

Can someone help me please !

Mathematics
1 answer:
zlopas [31]3 years ago
4 0

Answer:

https://youtu.be/WYNfQabLpuk

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Evaluate the expression under the given conditions. cos(θ − ϕ); cos θ = 3 5 , θ in quadrant iv, tan ϕ = − 15 , ϕ in quadrant ii
GaryK [48]
Begin with  cos(θ) = 5/13, θ in Quadrant IV 

you should distinguish the 5-12-13 right-angled triangle 

and then cosØ = adjacent/hypotenuse 

x = 5, r = 13 , y = -12, since Ø is in IV 

and sinØ = -12/13 


also tan(ϕ) = −√15 = -√15/1 = y/x and ϕ is in II, 

y = √15 , x = -1 

r^2 = x^2 + y^2 = 15+1 = 16 

r = 4 

sinϕ = √15/4 , cosϕ = -1/4 
you must know that: 

cos(θ − ϕ) = cosθcosϕ + sinθsinϕ 

= (5/13)(-1/4) + (-12/13)(√15/4) 

= -5/52 - 12√15/52 

= (-5-12√15)/52 
7 0
3 years ago
20 POINTS BRAINLIEST
RSB [31]

Answer:

C

Step-by-step explanation:

Exponential decay should be in this format A = Ao × e^(-kt)

7 0
4 years ago
Expressions is equivalent to 2+13y−(2y+1)
scZoUnD [109]

Answer: 3y+8

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
Can you solve this? ;)
katovenus [111]
Hi there!

The answer is C.
25x + 12y + 4 \leqslant 130

The question has already revealed the following data:
x = number of tickets.
y = number of t-shirts.

We can now find the total cost function.
The cost of 1 ticket is $ 25
and therefore the total cost for all of the tickets is $25 ×
the amount of tickets, mathematically $25 × x, hence 25x.

The cost of 1 shirt is $ 12
and therefore the total cost for all of the tickets is $12 ×
the amount of shirts, mathematically $12 × y, hence 12y.

When making the total cost function, don't forget to include the service fee of $4.

Now we can conclude that the total cost function is the following:
25x + 12y + 4

Maya only has $130 and therefore the total cost must be smaller than or equal to this amount of money. The answer is C.
25x + 12y + 4 \leqslant 130
7 0
3 years ago
mrs. McCain had 3 folders. each folder had the same amount of papers in it. mrs. phillips gave mrs. McCain 7 more papers she end
Feliz [49]
Each folder must have 10 pages
!0 papers times 3 folders is 30 
plus the 7 pages equals 37
4 0
3 years ago
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