Step-by-step explanation:
The law of cosine states that:
, where C is the side opposite of angle theta, and A and B are the adjacent sides of the angle.
In this case, A is equal to 21, and B is equal to 30 (or it could also be the other way around). That means that:
(to nearest 6 digits)
X=<span><span><span>−7</span>±<span>√<span>49<span><span>−11</span><span>v2</span></span></span></span></span><span>v2
but if you are telling me for solving for something else tell me</span></span>
Answer:
45
Step-by-step explanation:
7. Let x be the money she began with, then
1/3 (x - 4/5 x) = 15
1/3 (1/5 x) = 15
1/15 x = 15
x = 15 * 15 = $225
Therefore, she started with $225
Let x be the number of students surveyed, then
1/2(x - 1/3x - 1/6x) = 9
1/2(1/2x) = 9
1/4x = 9
x = 4 * 9 = 36
Therefore, the number of students surveyed is 36.