How do you convert 2000 mg to grams? 2000mg = ___

Cos pi/4 cos pi/6= 1/2(___pi/12+cos 5pi/12) fill in the blank

inessss [21]

Answer:

$\cos(\frac{\pi}{4})\cos(\frac{\pi}{6})=\frac{1}{2}(\cos(\frac{\pi}{12})+\cos(\frac{5\pi}{12}))$

So the blank is cos.

Step-by-step explanation:

There is an identity for this:

$\cos(a)\cos(b)=\frac{1}{2}(\cos(a+b)+\cos(a-b))$

Let's see if this is fit by your left hand and right hand side:

So $a=\frac{\pi}{4}$ while $b=\frac{pi}{6}$ .

Let's plug these in to the identity above:

$\cos(\frac{\pi}{4})\cos(\frac{\pi}{6})=\frac{1}{2}(\cos(\frac{\pi}{4}+\frac{\pi}{6})+\cos(\frac{\pi}{4}-\frac{\pi}{6}))$

Ok, we definitely have the left hand sides are the same.

Let's see if the right hand sides are the same.

Before we move on let's see if we can find the sum and difference of $\frac{\pi}{4}$ and $\frac{\pi}{6}$ .

We will need a common denominator. How about 12? 12 works because 4 and 6 go into 12. That is 4(3)=12 and 6(2)=12.

$\frac{\pi}{4}+\frac{\pi}{6}=\frac{3\pi}{12}+\frac{2\pi}{12}=\frac{5\pi}{12}$ .

$\frac{\pi}{4}-\frac{\pi}{6}=\frac{3\pi}{12}-\frac{2\pi}{12}=\frac{\pi}{12}$ .

Let's go back to our identity now:

$\cos(\frac{\pi}{4})\cos(\frac{\pi}{6})=\frac{1}{2}(\cos(\frac{\pi}{4}+\frac{\pi}{6})+\cos(\frac{\pi}{4}-\frac{\pi}{6}))$

$\cos(\frac{\pi}{4})\cos(\frac{\pi}{6})=\frac{1}{2}(\cos(\frac{5\pi}{12})+\cos(\frac{\pi}{12}))$

We can rearrange the right hand side inside the ( ) using commutative property of addition:

$\cos(\frac{\pi}{4})\cos(\frac{\pi}{6})=\frac{1}{2}(\cos(\frac{\pi}{12})+\cos(\frac{5\pi}{12}))$

So comparing my left hand side to their left hand side we see that the blank should be cos.

4 0

3 years ago

A jar containing only nickels (n) and dimes (d) contains a total of 60 coins. the value of all the coins in the jar is $4.45. wr

natka813 [3]

<span>D=1.45/.05
D=29 DIMES.
60-29=31 NICKELS.
PROOF:
.05*31+.10*29=4.45
1.55+2.90=4.45
4.45=4.45 </span>

5 0

3 years ago

The radioactive isotope carbon-14 is present in small quantities in all life forms, and it is constantly replenished until the o

Fofino [41]

Answer:

a) k = 0.0001245 /year

b) The Shroud of Turin is 757.52 years old.

Step-by-step explanation:

a) dC/dt = - KC

dC/C = - kdt

Integrating the left hand side from C₀ to C₀/2 and the right hand side from 0 to t(1/2) (where t(1/2) is the radioactive isotope's half life)

In [(C₀/2)/C₀] = - k t(1/2)

In (1/2) = - k t(1/2)

- In 2 = - k t(1/2)

k = (In 2)/t₍₁,₂₎

t(1/2) is given in the question to be 5566 years

k = (In 2)/5566 = 0.0001245 /year

b) dC/C = - kdt

Integrating the left hand side from C₀ to C and the right hand side from 0 to t

In (C/C₀) = - kt

C/C₀ = e⁻ᵏᵗ

C = C₀ e⁻ᵏᵗ

When C = 91% of C₀ = 0.91 C₀, solve for t

0.91 C₀ = C₀ e⁻ᵏᵗ

0.91 = e⁻ᵏᵗ

e⁻ᵏᵗ = 0.91

- kt = In 0.91 = -0.00943

t = - 0.00943/(-0.0001245) = 757.52 years.

6 0

4 years ago

7000 cm² is the same area as<br> .......... m².

Dennis_Churaev [7]

Answer:

1000cm²=0.1m²

so 7000cm²=0.7m²

Step-by-step explanation:

please mark me as brainliest

5 0

3 years ago

Read 2 more answers

2(4x - 3) = 4x - 78<br> Solve for x

Natasha_Volkova [10]

First, expand the brackets on the left hand side.
You have: 8x-6=4x-78
Minus least number of x first on each side, so minus 4x
2x-6=-78
Then add 6 to both sides
2x= -72
Then divide both sides by 2 to get x on its own
X= -36
(-72/2=-36)

4 0

2 years ago

How do you convert 2000 mg to grams? 2000mg = ____g