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Slav-nsk [51]
3 years ago
13

write an equation to represent the relationship "a number decreased by negative 2 is equal to 21."Then solve the equqtion

Mathematics
2 answers:
Debora [2.8K]3 years ago
8 0
X - (-2) = 21 <== ur equation
x + 2 = 21
x = 21 - 2
x = 19
mars1129 [50]3 years ago
8 0
If it is a number (n) decreased by -2 is equal to 21 then the equation would be
21=n-2
To find n you would add 2 to the other side so 21+2=23
So the full equation with the answer would be
21=23-2
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Sine of x divided by one minus cosine of x + sine of x divided by one minus cosine of x = 2 csc x
kolbaska11 [484]

Answer:

The answer in the procedure

Step-by-step explanation:

we have

\frac{sin(x)}{1-cos(x)}+\frac{sin(x)}{1-cos(x)}=2csc(x)

Prove the identity

In this problem there is a mistake: in order to obtain an identity the second denominator at the left side must be 1 + cosx

so

\frac{sin(x)}{1-cos(x)}+\frac{sin(x)}{1+cos(x)}=2csc(x)

Adds fraction in the left side

\frac{sin(x)(1+cos(x)+sin(x)(1-cos(x)}{1-cos^{2} (x)}=2csc(x)\\ \\\frac{2sin(x)}{1-cos^{2} (x)}=2csc(x)

Remember that

csc(x)=\frac{1}{sin(x)}

and

sin^{2}(x)+cos^{2}(x)=1

sin^{2}(x)=1-cos^{2}(x)

substitute

\frac{2sin(x)}{sin^{2}(x)}=2\frac{1}{sin(x)}

Multiply both sides by sin(x)

(sin(x))\frac{2sin(x)}{sin^{2}(x)}=2

\frac{2sin^{2}(x)}{sin^{2}(x)}=2

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3 years ago
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Greeley [361]

Answer: Your input has more than one equals sign.

Step-by-step explanation:

6 0
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Read 2 more answers
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Answer:

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3 0
3 years ago
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777dan777 [17]

Answer:

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Step-by-step explanation:

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The alternate hypothesis is that people who favour ban on stem cell research is greater than 0.61

Proportion of population = 0.61

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Sample size = 554

Sample proportion = 360/554 = 0.649

As per test statistics –  

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So alpha value is 0.064.  

Thus, we will reject the null hypothesis  

7 0
3 years ago
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