This is the last question I need help on, thanks for helping me on this.

BC= 70

Step-by-step explanation:

If AC is equal to 140 and B is the midpoint of the line, then that would mean the line would be split in half thus having measures BA and BC. Both of the measures would have half of the full length so that would mean that BA and BC equals 70 since 140/2= 70

alot

step-by-step explanation:

its a wood chuck that can chuck wood

7.9m and 4.3°

step-by-step explanation:

let east be +x and north be +y, x = distance * cos θ, y = distance * sin θ  

for 3.5 south, y = -3.5  

for 8.2, x = 8.2 * cos 30 and y = 8.2 * sin 30  

for 15 west, x = -15  

total x = 8.2 * cos 30 – 15 ≈ -7.9  

total y = -3.5 + 8.2 * sin 30 = 0.6  

magnitude = [(8.2 * cos 30 – 15)^2 + 0.6^2)]^0.5  

the magnitude is approximately 7.9 m  

tan θ = y/x = 0.6/-7.9  

the angle is approximately 4.3˚ north of west