B-5=-2. Plz need answer asap b=what???plzzz6

Mathematics

1 answer:

ruslelena [56]3 years ago

7 0

Answer:

B=-2+5 collecting like terms

B=3 answer

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Find m∠A. Put the answer below. m∠A =

Ulleksa [173]

Angle A = 30 degrees

1) Use the Pythagorean Theorem: $a^{2} + b^{2} = c^{2}$

--> $12^{2} + (4\sqrt{3})^{2} = AC^{2}$

--> 144 + 48 = $AC^{2}$

--> 192 = $AC^{2}$

--> AC = $8\sqrt{3}$

2) Figuring out the type of triangle it is

There's a formula on the sides of a certain type of triangle:

--> Hypotenuse: a, Short Leg: a/2, Longer Leg: a/2 * $\sqrt{3}$

That type of triangle perfectly matches the sides of our triangle: 12, $4\sqrt{3}$ , $8\sqrt{3}$

Therefore, this triangle is a 30, 60, 90 triangle.

3) Finding the measure of angle A

--> Angle B is given: 90 degrees

--> The angle that's between Sides AB and AC is 30 degrees

Finally, we can conclude that Angle A is 30 degrees

7 0

2 years ago

NO LINKS!!! Please help fill in the blanks. Part 10a.

pogonyaev

Sound level is measured in decibels (dB).

The equation $\beta = 10\log\left(\frac{I}{I_0}\right)$ , where $I_0$ is the intensity of the threshold sound a human can hear ( $10^{-12}$ $\text{watts}$ / $\text{meter}^2$ ) and $I$ is the intensity of the sound being measured, gives the sound level, $\beta$

Example:

What was the intensity of the launch of NASA's Saturn V rocket, about 200 dB?

$\beta = 10\log\left(\frac{I}{I_0}\right)\\\\\text{Substitute.} \ 200 = 10\log\left(\frac{I}{10^{-12}}\right)\\\\\text{Isolate the log.} \ 20 = \log\left(\frac{I}{10^{-12}}\right)\\\\\text{Rewrite into exponential form.} \ \frac{I}{10^{-12}} = 10^{20}\\\\\text{Solve for the variable}\\ \ I = (10^{20})(10^{-12}) = 10^8 = 100,000,000 = \text{100 million watts/}m^2$