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2 years ago

Find all the solutions to the equation 7sin^2x -14sinx+2=-5

1 answer:

7 0

I will get you started.

Let sin x = u

Then 7sin^2x -14sinx+2=-5 become

7u^2 - 14u = - 5

7u^2 - 14u + 5 = 0

Steps:

1. Solve for u.

2. Back- substitute for u.

3. Take the arcsin on both sides to find the angle(s).

You finish.

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? Do you believe you have a certain mindset when confronted with a math<br> ?

LenaWriter [7]

Answer: no

Step-by-step explanation:

8 0

2 years ago

In a random sample of fivefive microwave ovens, the mean repair cost was $75.0075.00 and the standard deviation was $13.0013.

Radda [10]

<h2>Answer with explanation:</h2>

As per given , we have

Sample size : n= 5

Degree pf freedom = : df= 5-1=4

$\mu=\$75.00$

$\sigma=\$13.00$

Significance level for 90% confidence = $\alpha=1-0.90=0.1$

Using t-value table , t-critical value for 90% confidence:

$t_{\alpha/2, df}=t_{0.05, 4}=2.132.$

Margin of error of $\mu$ : $E=t_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}\\\\(2.132)\dfrac{13}{\sqrt{5}}=12.3949720129\approx12.39$

Interpretation : The repair cost will be within $12.39 of the real population mean value $\mu$ 90% of the time.

7 0

3 years ago

A man shares his money between his sons, Cyrus and Peter in the ratio 4 : 9. If Cyrus' share is GH¢100, find the amount shared a

statuscvo [17]

Answer:

peter will get 225

6 0

2 years ago

How does tan 135 degrees compare to tan -135 degrees

Anna007 [38]

Evaluating the tangent function for the two values we obtain the following:
tan 135=tan(135+180)=tan 315=-1

next:
tan -135=tan(180-135)=tan 45=1
thus comparing the two we see that tan 135 is negative while tan -135 is positive

3 0

3 years ago

The perimeter of a regular hexagon is ninety-six centimetres. Find the length of each side.

rusak2 [61]

Answer:

54cm, which is one side length

Step-by-step explanation:

The sum of all of the sides are 6, it's a regular hexagon the perimemter is just six times one side 36cm

Hope It Helps!

8 0

2 years ago