Answer:
21
Step-by-step explanation:
BDE and BAC are similar figures
BD/BA = BE/BC
18/(18+36) = a/(a+42)
18/54 = a/(a+42)
1/3 = a/(a+42)
a+42 = 3a
42 = 2a
a = 42/2
a = 21
Answer:
Step-by-step explanation:
if sum of two angles 180 degree then is called is called supplementary angles.
here , one angle is 118 degree . Let the other angle be x
x + 118 = 180 degree
x = 180 - 118
x = 62 degree
therefore , the measure of other angle is 62 degree.
Answer:
12/13
Step-by-step explanation:
The cosine of an angle in a triangle can be calculated as a relation between the adjacent side and the hypothenuse. So, in this case the adjacent side of θ is 24 and the hypothenuse is 26.
Then:
cos(θ) = 24/26 = 12/13
Step-by-step explanation:
3(x - 3) + 2x + 9 - 2x + 2(x - 1)
3x - 9 + 2x + 9 - 2x + 2x - 2
Solving like terms
5x - 2
5x = 2
x = 2/ 5
I think she incorrectly applied the multiplication and division properties of equality