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3 years ago

Can someone please help me please help me I really need help please help me .

Mathematics

2 answers:

Mariulka [41]3 years ago

5 0

Answer:

$B) sin(\alpha )$

Step-by-step explanation:

$sin(90-0)=Cos(0)$

$Cos(90-0)=sin(0)$

$So...$

$Cos(90-\alpha )= sin(\alpha )$

$------------$

hope it helps...

have a great day!!

pochemuha3 years ago

3 0

Answer:

cos(90°-a)

since it lies in first quadrant

sina

your option is B.sin(a)

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Plz help me this is for tomorrow waited last minute

soldi70 [24.7K]

Angle a =40° beacuse they are vertical angle
b will be 180- 40+90=50°
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8 0

4 years ago

Multiplication mod 29 by 30 is equivalent to standard multiplication by ___

arsen [322]

The awnser will be 870.

4 0

3 years ago

An analytical laboratory is asked to evaluate the claim that the concentration of the active ingredient in a specimen is 86%. Th

Olenka [21]

Answer:

Decision rule

Reject null hypothesis

Conclusion

There is significance evidence that the true mean is different from 0.86

Step-by-step explanation:

From the question we are told that

The population mean $\mu = 0.86$

The sample is mean is $\= x = 0.8708$

The standard deviation is $\sigma = 0.0068$

The level of significance is $\alpha = 0.01$

The sample size n = 3

The null hypothesis is $\mu = 0.86$

The alternative hypothesis is $\mu \ne 0.86$

Generally the test statistics is mathematically represented as

$z = \frac{\= x - \mu }{ \frac{\sigma}{\sqrt{n} } }$

=> $z = \frac{ 0.8708 - 0.86 }{ \frac{0.0068}{\sqrt{3} } }$

=> $z = 2.751$

Generally p- value is mathematically represented as

$p-value = 2 P(z >2.751 )$

From the z-table

$P(z >2.751 ) = 0.0029707$

$p-value = 2 * 0.0029707$

=> $p-value = 0.00594$

From the obtained question we see that $p-value < \alpha$

Hence we reject the null hypothesis

6 0

3 years ago

A pink crayon is made with 12 mL of red wax for every 5 mL of white wax.

11111nata11111 [884]

Answer:c

Step-by-step explanation:

7 0

3 years ago

100 POINTS HELP ME PLEASE!!!!! WILL MARK YOU BRAINIEST!!!!!!

Dimas [21]

We just need to find the area of the parallelogram and the triangle, and then add.

Parallelogram: The area is base times height. So, we can write 4 * 6 = 24 in^2.

Triangle: The area is base times height divided by two. So, it's 4 * 6 / 2 = 12 in^2.

24 + 12 gives us an answer of 36 inches squared.

6 0

3 years ago

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