3) Whenever you have in a triangle 2 known sides and the angle comprise between those side, then you apply the law of cosine to calculate the 3rd side:
BC² = AB² + AC² - 2AB.BC.cos(25.6)
BC² = 306² + 275² - 2(306).(275).cos(25.6)
BC² = 93,636 + 75,625 - 168,300.(0.901833), note that cos(25.6) = 0.901...]
BC² = 17,482.6 and BC = √17,482.6 → BC = 132.22 m or 132 (rounded)
Number 6 and 9 follow the same methodology.
Hope it helped you
Answer:
x = 10
y = 40
Step-by-step explanation:
DE is a straight line so the sum of angles DBA and ABE is equal to 180
13x - 18 + 5x + 18 = 180 add like terms
18x = 180 divide both sides by 18
x = 10
Same rule applies when calculating value of y
3y - 52 + 2y + 32 = 180 add like terms
5y - 20 = 180 add 20 to both sides
5y = 200 divide both sides by 5
y = 40
The answer will be 0.932057
I believe the correct answer is D.
<span>C. No, because although the results differ among the four surveys, the sample method used for all was the same. Luc RANDOMLY selects 40 students in every survey. Random selection in surveys do not create bias and the results are highly credible. This is because there are no preconceived notions or factors that affect the responses of people being surveyed.</span>
