he equation of any horizontal line is
y = .. a number
The x-value has no effect on the equation or on the line at all, as long as y-value stays the same.
In this case the line passes though the point (−8,9)
which tells us that the y-value we want is 9.
Therefore the equation is y=9
The identity in question is
cos(a - b) = cos(a) cos(b) + sin(a) sin(b)
so that
cos(a - b) = 12/37 cos(a) + 3/5 sin(b)
Since both a and b lie in the first quadrant, both cos(a) and sin(b) will be positive. Then it follows from the Pythagorean identity,
cos²(x) + sin²(x) = 1,
that
cos(a) = √(1 - sin²(a)) = 4/5
and
sin(b) = √(1 - cos²(b)) = 35/37
So,
cos(a - b) = 12/37 • 4/5 + 3/5 • 35/37 = 153/185
F(3k)=3k +7 Equals 9k+7. So 9k+7 would be the Answer.
Answer:
Step-by-step explanation:
Let the third side of the triangle be 
.
We can apply the cosine rule to find 
.
We evaluate to obtain;
We take the positive square root of both sides to obtain;
The correct answer is B.
155/(2 1/2)=62
Sam drives at 62 m/h
62*4=248
Sam would drive 248 miles in 4 hours.
Hope this helps :)
