Answer:

Step-by-step explanation:
we know that
The formula of the law of cosines is equal to

where
a, b and c are sides. C is the angle opposite side c
In this context
The formula to calculate the measure of angle X is equal to

substitute the given values

solve for cos(X)






Answer: 
<u>Step-by-step explanation:</u>
To find the inverse, swap the x's and y's and solve for y. <em>Note: f(x) is y</em>
<em>
</em>
Answer:idk
Step-by-step explanation: snnd
Let X be a random sample representing the score of a student in the American Chemical Society Examination.
P(450 < x < 500) = P((450 - 500)/(90/sqrt(25)) < z < (500 - 500)/(90/sqrt(25))) = P(-2.778 < z < 0) = P(z < 0) - P(z < -2.778) = P(z < 0) - [1 - P(z < 2.778)] = P(z < 0) + P(z < 2.778) - 1 = 0.5 + 0.99727 - 1 = 0.49727 = 49.7%
Round 2.81 to 2.8 and 3.72 to 3.7. Add both together to get 6.5