c. –46
b. –44
d. –43
Answer:
C: tan 60 = √3
Step-by-step explanation:
Let the adjacent part of the triangle be x and let the opposite side be y.
Thus, from trigonometric ratios;
x/10 = cos 60
We are given cos 60 = ½
Thus;
x/10 = ½
x = ½ × 10
x = 5
Similarly;
y/10 = sin 60
Now,from trigonometric relationship we know that; sin 60 = cos 30. Thus;
y/10 = cos 30
We are given cos 30 = (√3)/2
Thus;
y/10 = (√3)/2
y = 10 × (√3)/2
y = 5√3
Since it is a right angle triangle with one angle being 60°, it means the other one is 30° since sum of angles in a triangle is 180°.
Thus;
5/(5√3) = tan 30°
1/√3 = tan 30
Similarly;
5/10 = sin 60°
sin 60° = ½
Also;
tan 60 = (5√3)/5
tan 60 = √3
Also;
sin 30 = 5/10
sin 30 = ½
Looking at the options, the only correct one is Option C
g2 – 4g – 21 = (g – )(g + )
Answer:
Step-by-step explanation:
To complete the left side of the equation, we need to bring it to the form
expanding this expression we get:
Thus we have
from here we see that for both sides of the equation to be equal, it must be that
.
Getting rid of the negative signs we get:
At this point we can either guess the solution to this system (that's how you usually solve these types of problems) or solve for and systematically.
The solutions to this set are and . (you have to guess on this—it's easier)
Therefore, we have
which completes our equation
Answer: -7 and +3
did the assignment