4 years ago

Can you please help me figure out how the answer is 1/9 im getting 9

Mathematics

1 answer:

timama [110]4 years ago

6 0

Can you upload another picture, you cannot really see your problem

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In a triangle ABC, AB = 7, AC = 8, BC = 3, what is cos(A)?

kotegsom [21]

Use the cosine rule.
c=AB=7
b=AC=8
a=BC=3
a^2=b^2+c^2-2bc(cos(A))
=>
cos(A)=(b^2+c^2-a^2)/(2bc)
=(7^2+8^2-3^2)/(2*7*8)
=13/14
=0.9286

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Answer:

3.) (x + 5) (x - 6)

Step-by-step explanation:

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x^2 - x - 30

Hint: | Factor x^2 - x - 30 by finding two numbers whose product is -30 and whose sum is -1.

The factors of -30 that sum to -1 are 5 and -6. So, x^2 - x - 30 = (x + 5) (x - 6):

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2 years ago

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The amount of water person typically drinks in a week has a mean of 100 ounces and a standard deviation of 15 ounces. Using the

e-lub [12.9K]

Solution: We are given:

$\mu=100,\sigma=15$

We have to find the amount of water that represents the top 97.5%.

We need to find the z value corresponding to probability to 0.975. Using the standard normal table, we have:

$z(0.975)=1.96$

Now using the z score formula, we have:

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

$1.96=\frac{x-100}{15}$

$1.96 \times 15 = x-100$

$29.4=x-100$

$x=100+29.4 = 129.4$

Therefore, 129.4 ounces amount of water represents the top 97.5%

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3 years ago

Can you please help me figure out how the answer is 1/9 im getting 9​

Can you please help me figure out how the answer is 1/9 im getting 9