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3 years ago

Can you show me the steps to find the equation for (3×10)×8= ×(10×8)

Mathematics

1 answer:

Nimfa-mama [501]3 years ago

7 0

(3·10)·8=x(10·8)

30 ·8 = x ·80

240=80x

x=3

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{ TOPIC -- TRIGONOMETRIC IDENTITIES }

UkoKoshka [18]

LHS ⇒ RHS:
Identities:
[1] cos(2A) = 2cos²(A) - 1 = 1 - 2sin²(A)
[2] sin(2A) = 2sin(A)cos(A)
[3] sin(A + B) = sin(A)cos(B) + cos(A)sin(B)
[4] cos(A + B) = cos(A)cos(B) - sin(A)sin(B)

cos(x) - cos(x + 2Θ)
= cos(x) - (cos(x)cos(2Θ) - sin(x)sin(2Θ)) [4]
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= 2sin²(Θ)cos(x) + 2sin(Θ)sin(x)cos(Θ)
= 2sin(Θ)(sin(Θ)cos(x) + sin(x)cos(Θ))
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8 0

3 years ago

Need help with number 7

Bess [88]

Answer:

$95,183.04

Step-by-step explanation:

$A = P(1 + \frac{r}{n} )^{nt}$

A = final amount

P = initial principal balance

r = interest rate

n = number of times interest applied per time period

t = number of time periods elapsed

(i used a calculator but theres the formula^^ T-T)

5 0

3 years ago

Read 2 more answers

Given angle EFG has angle bisector FH, where EF = GF, find the value of y if EH = 5y + 10 and HG = 28 - y.

Whitepunk [10]

Answer:

y = 3

Step-by-step explanation:

*As seen in the photo, the fact that EF = GF and the bisector being there makes EH = HG.

5y + 10 = 28 - y

*Add y to both sides.

6y + 10 = 28

*Subtract 10 from both sides.

6y = 18

*Divide both sides by 6.

y = 3

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Answer:

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zaharov [31]

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